Extremely slow wi-fi, tried everything I found

pepedentpresi

Prominent
Oct 6, 2017
3
0
510
My internet became increasingly slow this past week (going from 0-500bytes to at most 60kbps, and it keeps going up and down and up and down, but never works). This is on wi-fi (im on ethernet right now and it's fine), and it only started recently, out of nowhere. I've already ran my McAfee, Malwarebytes, AdwCleaner, adware tool, rootkit tool, Spybot, Superantispyware, the native virus searcher, ESET onlien scna, etc, so I think it's not some virus. I keep getting err_internet_closed, err_internet_timeout and simillar when it goes down to the minimum speed. I can find no errors with the windows troubleshooting, the dell support assist troubleshooting does nothing too. I updated every driver (checked it myself), bios, everything I had too. Cleaned every cache, every cookie and similar several times, reseted the router and PC, did those ipconfig and netsh commands everyone tells people with these problems to do, and even reset the network on settings and reinstalled the drivers, but the problem didn't go away.
Tried to use the google DNS, didn't work. Neither did turning off the firewall.
Doesn't matter how close I am to the router, the speed doesn't change.
Every other computer in the network works fine, as do cellphones.
I checked with HijackThis but have no idea what to do with it's log.
What can I possibly do now?

I have a qualcomm qca61x4a 802.11ac wireless adapter, windows 10, on a dell inspiron 7460

I ran hijackthis to see if I got anything, but I don't know how to read it. Here's my log:
Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 02:57:48, on 06/10/2017
Platform: Unknown Windows (WinNT 6.02.1008)
MSIE: Internet Explorer v11.0 (11.00.15063.0608)


Boot mode: Normal

Running processes:
C:\Program Files\Malwarebytes\Anti-Malware\mbamtray.exe
C:\Program Files (x86)\NVIDIA Corporation\NvContainer\nvcontainer.exe
C:\Program Files (x86)\Steam\Steam.exe
C:\Users\User\AppData\Roaming\uTorrent\uTorrent.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\Intel Driver and Support Assistant\DSATray.exe
C:\Users\User\AppData\Roaming\uTorrent\updates\3.5.0_44090\utorrentie.exe
C:\Users\User\AppData\Roaming\uTorrent\updates\3.5.0_44090\utorrentie.exe
C:\Program Files\Intel\Intel(R) Rapid Storage Technology\IAStorIcon.exe
C:\Program Files (x86)\Steam\bin\cef\cef.win7\steamwebhelper.exe
C:\Program Files (x86)\Steam\bin\cef\cef.win7\steamwebhelper.exe
C:\Program Files (x86)\NVIDIA Corporation\NvNode\NVIDIA Web Helper.exe
C:\Program Files (x86)\Dell Update\DellUpTray.exe
C:\Users\User\Downloads\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://dell17win10.msn.com/?pc=DCTE
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = Preserve
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://go.microsoft.com/fwlink/p/?LinkId=619797&pc=UE03&ocid=UE03DHP
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/p/?LinkId=255141
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,AutoConfigURL = 187.59.128.28
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=C:\Windows\system32\userinit.exe
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files (x86)\Java\jre1.8.0_144\bin\ssv.dll
O2 - BHO: McAfee WebAdvisor BHO - {B164E929-A1B6-4A06-B104-2CD0E90A88FF} - c:\PROGRA~2\mcafee\SITEAD~1\mcieplg.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre1.8.0_144\bin\jp2ssv.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [DSATray] C:\Program Files (x86)\Intel Driver and Support Assistant\DsaTray.exe
O4 - HKCU\..\Run: [OneDrive] "C:\Users\User\AppData\Local\Microsoft\OneDrive\OneDrive.exe" /background
O4 - HKCU\..\Run: [Steam] "C:\Program Files (x86)\Steam\steam.exe" -silent
O4 - HKCU\..\Run: [GUDelayStartup] "C:\Program Files (x86)\Glary Utilities 5\StartupManager.exe" -delayrun
O4 - HKCU\..\Run: [Skype] "C:\Program Files (x86)\Skype\Phone\Skype.exe" /minimized /regrun
O4 - HKCU\..\Run: [uTorrent] "C:\Users\User\AppData\Roaming\uTorrent\uTorrent.exe" /MINIMIZED
O4 - HKCU\..\Run: [SUPERAntiSpyware] C:\Program Files\SUPERAntiSpyware\SUPERAntiSpyware.exe
O4 - HKCU\..\Run: [DellSystemDetect] C:\Users\User\AppData\Local\Apps\2.0\1L7Z8CGJ.T9K\JNY4MW57.EH4\dell..tion_831211ca63b981c5_0008.0008_b150a6542eb950c1\DellSystemDetect.exe 4zZn5oeQk9WMM5ZBt7fsYA==
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\Program Files (x86)\Microsoft Office\Root\Office16\EXCEL.EXE/3000
O8 - Extra context menu item: Se&nd to OneNote - res://C:\Program Files (x86)\Microsoft Office\Root\Office16\ONBttnIE.dll/105
O9 - Extra button: Send to OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\root\Office16\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: Se&nd to OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\root\Office16\ONBttnIE.dll
O9 - Extra button: McAfee WebAdvisor - {48A61126-9A19-4C50-A214-FF08CB94995C} - c:\PROGRA~2\mcafee\SITEAD~1\mcieplg.dll
O9 - Extra 'Tools' menuitem: McAfee WebAdvisor - {48A61126-9A19-4C50-A214-FF08CB94995C} - c:\PROGRA~2\mcafee\SITEAD~1\mcieplg.dll
O9 - Extra button: OneNote Lin&ked Notes - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\root\Office16\ONBttnIELinkedNotes.dll
O9 - Extra 'Tools' menuitem: OneNote Lin&ked Notes - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\root\Office16\ONBttnIELinkedNotes.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O18 - Protocol: mso-minsb-roaming.16 - {83C25742-A9F7-49FB-9138-434302C88D07} - C:\Program Files (x86)\Microsoft Office\root\Office16\MSOSB.DLL
O18 - Protocol: mso-minsb.16 - {42089D2D-912D-4018-9087-2B87803E93FB} - C:\Program Files (x86)\Microsoft Office\root\Office16\MSOSB.DLL
O18 - Protocol: osf-roaming.16 - {42089D2D-912D-4018-9087-2B87803E93FB} - C:\Program Files (x86)\Microsoft Office\root\Office16\MSOSB.DLL
O18 - Protocol: osf.16 - {5504BE45-A83B-4808-900A-3A5C36E7F77A} - C:\Program Files (x86)\Microsoft Office\root\Office16\MSOSB.DLL
O18 - Protocol: sacore - {5513F07E-936B-4E52-9B00-067394E91CC5} - c:\PROGRA~2\mcafee\SITEAD~1\mcieplg.dll
O18 - Protocol: tbauth - {14654CA6-5711-491D-B89A-58E571679951} - C:\Windows\SysWOW64\tbauth.dll
O18 - Protocol: windows.tbauth - {14654CA6-5711-491D-B89A-58E571679951} - C:\Windows\SysWOW64\tbauth.dll
O18 - Filter: application/x-mfe-ipt - {3EF5086B-5478-4598-A054-786C45D75692} - c:\PROGRA~2\mcafee\msc\mcsniepl.dll
O23 - Service: SAS Core Service (!SASCORE) - SUPERAntiSpyware.com - C:\Program Files\SUPERAntiSpyware\SASCORE64.EXE
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: AtherosSvc - Windows (R) Win 7 DDK provider - C:\Program Files (x86)\Qualcomm\Bluetooth Suite\adminservice.exe
O23 - Service: BattlEye Service (BEService) - Unknown owner - C:\Program Files (x86)\Common Files\BattlEye\BEService.exe
O23 - Service: ClientAnalyticsService - McAfee, Inc. - C:\Program Files\Common Files\McAfee\ClientAnalytics\Legacy\McClientAnalytics.exe
O23 - Service: Intel(R) Content Protection HECI Service (cphs) - Intel Corporation - C:\Windows\System32\DriverStore\FileRepository\ki121253.inf_amd64_ee8f505206e6a0ce\IntelCpHeciSvc.exe
O23 - Service: Intel(R) Content Protection HDCP Service (cplspcon) - Intel Corporation - C:\Windows\System32\DriverStore\FileRepository\ki121253.inf_amd64_ee8f505206e6a0ce\IntelCpHDCPSvc.exe
O23 - Service: Dell Data Vault Service API (DDVCollectorSvcApi) - Dell Inc. - C:\Program Files\Dell\DellDataVault\DDVCollectorSvcApi.exe
O23 - Service: Dell Data Vault Collector (DDVDataCollector) - Dell Inc. - C:\Program Files\Dell\DellDataVault\DDVDataCollector.exe
O23 - Service: Dell Data Vault Processor (DDVRulesProcessor) - Dell Inc. - C:\Program Files\Dell\DellDataVault\DDVRulesProcessor.exe
O23 - Service: Dell Help & Support - Dell Inc. - C:\Program Files\Dell\Dell Help & Support\MDLCSvc.exe
O23 - Service: Dell SupportAssist Remediation - Dell - C:\Program Files\Dell\SARemediation\agent\DellSupportAssistRemedationService.exe
O23 - Service: Dell Digital Delivery Service (DellDigitalDelivery) - Dell Products, LP. - c:\Program Files (x86)\Dell Digital Delivery\DeliveryService.exe
O23 - Service: Dell Update Service (DellUpdate) - Dell Inc. - C:\Program Files (x86)\Dell Update\DellUpService.exe
O23 - Service: @%SystemRoot%\system32\DiagSvcs\DiagnosticsHub.StandardCollector.ServiceRes.dll,-1000 (diagnosticshub.standardcollector.service) - Unknown owner - C:\Windows\system32\DiagSvcs\DiagnosticsHub.StandardCollector.Service.exe (file missing)
O23 - Service: Intel(R) Driver & Support Assistant (DSAService) - Intel - C:\Program Files (x86)\Intel Driver and Support Assistant\DSAService.exe
O23 - Service: EasyAntiCheat - EasyAntiCheat Ltd - C:\Windows\system32\EasyAntiCheat.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: @oem18.inf,%ServiceDisplayName%;ESIF Upper Framework Service (esifsvc) - Unknown owner - C:\Windows\system32\Intel\DPTF\esif_uf.exe (file missing)
O23 - Service: Energy Server Service queencreek (ESRV_SVC_QUEENCREEK) - Unknown owner - C:\Program Files\Intel\SUR\QUEENCREEK\esrv_svc.exe
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: Serviço do Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Serviço do Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: McAfee Home Network (HomeNetSvc) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\Platform\McSvcHost\McSvHost.exe
O23 - Service: Intel(R) Rapid Storage Technology (IAStorDataMgrSvc) - Intel Corporation - C:\Program Files\Intel\Intel(R) Rapid Storage Technology\IAStorDataMgrSvc.exe
O23 - Service: Intel(R) HD Graphics Control Panel Service (igfxCUIService2.0.0.0) - Intel Corporation - C:\Windows\System32\DriverStore\FileRepository\ki121253.inf_amd64_ee8f505206e6a0ce\igfxCUIService.exe
O23 - Service: Intel(R) Capability Licensing Service TCP IP Interface - Intel(R) Corporation - C:\Program Files\Intel\iCLS Client\SocketHeciServer.exe
O23 - Service: Intel(R) Dynamic Application Loader Host Interface Service (jhi_service) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL\jhi_service.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Intel(R) Management and Security Application Local Management Service (LMS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\LMS\LMS.exe
O23 - Service: Malwarebytes Service (MBAMService) - Malwarebytes - C:\Program Files\Malwarebytes\Anti-Malware\mbamservice.exe
O23 - Service: McAfee SiteAdvisor Service - McAfee, Inc. - C:\Program Files (x86)\McAfee\SiteAdvisor\McSACore.exe
O23 - Service: McAfee AP Service (McAPExe) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\VSCore_15_7\McApExe.exe
O23 - Service: McAfee Activation Service (McAWFwk) - McAfee, Inc. - c:\PROGRA~1\COMMON~1\mcafee\actwiz\mcawfwk.exe
O23 - Service: McAfee Boot Delay Start Service (McBootDelayStartSvc) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\Platform\McSvcHost\McSvHost.exe
O23 - Service: McAfee CSP Service (mccspsvc) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\CSP\2.5.312.0\\McCSPServiceHost.exe
O23 - Service: McAfee Platform Services (mcpltsvc) - McAfee, Inc. - C:\Program Files\Common Files\mcafee\platform\McSvcHost\McSvHost.exe
O23 - Service: McAfee Proxy Service (McProxy) - McAfee, Inc. - C:\Program Files\Common Files\mcafee\platform\McSvcHost\McSvHost.exe
O23 - Service: McAfee Firewall Core Service (mfefire) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\SystemCore\mfefire.exe
O23 - Service: McAfee Service Controller (mfemms) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\SystemCore\mfemms.exe
O23 - Service: McAfee Validation Trust Protection Service (mfevtp) - Unknown owner - C:\Windows\system32\mfevtps.exe (file missing)
O23 - Service: McAfee Module Core Service (ModuleCoreService) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\ModuleCore\ModuleCoreService.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: McAfee Anti-Spam Service (MSK80Service) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\Platform\McSvcHost\McSvHost.exe
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NVIDIA LocalSystem Container (NvContainerLocalSystem) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\NvContainer\nvcontainer.exe
O23 - Service: NVIDIA NetworkService Container (NvContainerNetworkService) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\NvContainer\nvcontainer.exe
O23 - Service: NVIDIA Display Container LS (NVDisplay.ContainerLocalSystem) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\Display.NvContainer\NVDisplay.Container.exe
O23 - Service: NVIDIA Telemetry Container (NvTelemetryContainer) - NVIDIA Corporation - C:\Program Files (x86)\NVIDIA Corporation\NvTelemetry\NvTelemetryContainer.exe
O23 - Service: Origin Client Service - Electronic Arts - C:\Program Files (x86)\Origin\OriginClientService.exe
O23 - Service: Origin Web Helper Service - Electronic Arts - C:\Program Files (x86)\Origin\OriginWebHelperService.exe
O23 - Service: Intel Security PEF Service (PEFService) - Intel Security, Inc. - C:\Program Files\Common Files\Intel Security\PEF\CORE\PEFService.exe
O23 - Service: Rivet Dynamic Bandwidth Management (RNDBWM) - CloudBees, Inc. - C:\Program Files\Rivet Networks\SmartByte\RNDBWMService.exe
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: Realtek Audio Service (RtkAudioService) - Realtek Semiconductor - C:\Program Files\Realtek\Audio\HDA\RtkAudioService64.exe
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\SecurityHealthAgent.dll,-1002 (SecurityHealthService) - Unknown owner - C:\Windows\system32\SecurityHealthService.exe (file missing)
O23 - Service: @%SystemRoot%\system32\SensorDataService.exe,-101 (SensorDataService) - Unknown owner - C:\Windows\System32\SensorDataService.exe (file missing)
O23 - Service: Skype Updater (SkypeUpdate) - Skype Technologies - C:\Program Files (x86)\Skype\Updater\Updater.exe
O23 - Service: SmartByte Network Service (SmartByte Network Service x64) - Rivet Networks - C:\Program Files\Rivet Networks\SmartByte\SmartByteNetworkService.exe
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spectrum.exe,-101 (spectrum) - Unknown owner - C:\Windows\system32\spectrum.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: Steam Client Service - Valve Corporation - C:\Program Files (x86)\Common Files\Steam\SteamService.exe
O23 - Service: Dell SupportAssist Agent (SupportAssistAgent) - Dell Inc. - C:\Program Files\Dell\SupportAssistAgent\bin\SupportAssistAgent.exe
O23 - Service: Intel(R) System Usage Report Service SystemUsageReportSvc_QUEENCREEK (SystemUsageReportSvc_QUEENCREEK) - Unknown owner - C:\Program Files\Intel Driver and Support Assistant\SUR\SurSvc.exe
O23 - Service: @%SystemRoot%\system32\TieringEngineService.exe,-702 (TieringEngineService) - Unknown owner - C:\Windows\system32\TieringEngineService.exe (file missing)
O23 - Service: TrueColorALS - Unknown owner - C:\Program Files\TrueColor\TrueColorALS.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: User Energy Server Service queencreek (USER_ESRV_SVC_QUEENCREEK) - Unknown owner - C:\Program Files\Intel\SUR\QUEENCREEK\esrv_svc.exe
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: Waves Audio Services (WavesSysSvc) - Waves Audio Ltd. - c:\Program Files\Waves\MaxxAudio\WavesSysSvc64.exe
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%ProgramFiles%\Windows Defender\MpAsDesc.dll,-320 (WdNisSvc) - Unknown owner - C:\Program Files (x86)\Windows Defender\NisSrv.exe (file missing)
O23 - Service: @%ProgramFiles%\Windows Defender\MpAsDesc.dll,-310 (WinDefend) - Unknown owner - C:\Program Files (x86)\Windows Defender\MsMpEng.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)

--
End of file - 17557 bytes
 

gracey66

Prominent
Jan 25, 2018
2
0
510



 

gracey66

Prominent
Jan 25, 2018
2
0
510
Hey pepedentpresi,
Not too sure if you managed to solve this issue, but I had a similar problem (Wi-Fi extremely slow i.e. < 1 Mbps download speed) on my Dell Inspiron 24 - 5488 Series all-in-one. After two calls with Dell, it turns out that the issue was caused by the SmartByte Network Service x64 being set to 'Automatic'. Once the Startup type for this service was set to 'Disabled', my Wi-Fi network speed return to normal (around 25 Mbps). Not too sure what other flow-on effects this setting may have, but for the time being, this has certainly done the trick :)