"Cannot find explorer.exe" "Cannot find rundll32.exe"

As I boot my computer up, my background loads, but explorer.exe does not start. I attempt to manually boot it with the Task Manager, but it gives me the message "explorer.exe cannot be found." I cannot run regedit or msconfig either. I also receive the same message with rundll32.exe. I'm fairly sure I do not have the Windows XP CD.
Here's my recent HijackThis log:

Running processes:
C:\WINDOWS\system32\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Common Files\Authentium\AntiVirus\dvpapi.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\taskmgr.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Common Files\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Common Files\Microsoft Shared\Windows Live\WLLoginProxy.exe
F:\HijackThis.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
C:\Program Files\Common Files\Microsoft Shared\Windows Live\WLLoginProxy.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
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 = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://my.netzero.net/s/sp?r=al&cf [...] HS&O=I&UT=
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\twex.exe,C:\WINDOWS\system32\ntos.exe,
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - C:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Program Files\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Program Files\Google\Google Toolbar\GoogleToolbar.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\5.1.1309.3572\swg.dll
O2 - BHO: MSN Search Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Toolbar Suite\TB\02.05.0001.1119\en-us\msntb.dll
O3 - Toolbar: HP view - {B2847E28-5D7D-4DEB-8B67-05D28BCF79F5} - C:\Program Files\HP\Digital Imaging\bin\HPDTLK02.dll
O3 - Toolbar: MSN Search Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Toolbar Suite\TB\02.05.0001.1119\en-us\msntb.dll
O3 - Toolbar: &Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Program Files\Google\Google Toolbar\GoogleToolbar.dll
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [hpWirelessAssistant] C:\Program Files\hpq\HP Wireless Assistant\HP Wireless Assistant.exe
O4 - HKLM\..\Run: [SynTPLpr] C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [eabconfg.cpl] C:\Program Files\HPQ\Quick Launch Buttons\EabServr.exe /Start
O4 - HKLM\..\Run: [LSBWatcher] c:\hp\drivers\hplsbwatcher\lsburnwatcher.exe
O4 - HKLM\..\Run: [Home Theater SchSvr] "C:\Program Files\Common Files\InterVideo\SchSvr\SchSvr.exe"
O4 - HKLM\..\Run: [WINREMOTE] "C:\Program Files\InterVideo\Common\Bin\WinRemote.exe"
O4 - HKLM\..\Run: [Logitech Hardware Abstraction Layer] KHALMNPR.EXE
O4 - HKLM\..\Run: [PRISMSVR.EXE] "C:\WINDOWS\system32\PRISMSVR.EXE" /APPLY
O4 - HKLM\..\Run: [SMSystemAnalyzer] "C:\Program Files\iolo\System Mechanic 7\SMSystemAnalyzer.exe"
O4 - HKLM\..\Run: [Symantec PIF AlertEng] "C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe" /a /m "C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\AlertEng.dll"
O4 - HKLM\..\Run: [My Web Search Bar Search Scope Monitor] "C:\PROGRA~1\MYWEBS~1\bar\1.bin\m3SrchMn.exe" /m=2 /w
O4 - HKLM\..\Run: [ClamWin] "C:\Program Files\ClamWin\bin\ClamTray.exe" --logon
O4 - HKLM\..\Run: [PCLEUSBTip] C:\Program Files\Pinnacle\Shared Files\Programs\USBTip\USBTip.exe
O4 - HKLM\..\Run: [USB2Check] RUNDLL32.EXE "C:\WINDOWS\system32\PCLECoInst.dll",CheckUSBController
O4 - HKLM\..\Run: [USBToolTip] "C:\Program Files\Pinnacle\Shared Files\\Programs\USBTip\USBTip.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [reader_s] C:\WINDOWS\System32\reader_s.exe
O4 - HKLM\..\Run: [iolo AntiVirus] "C:\Program Files\iolo\AntiVirus\ioloAV.exe"
O4 - HKLM\..\Run: [VT100 Emulator] C:\WINDOWS\system32\VT100.EXE
O4 - HKCU\..\Run: [] C:\DOCUME~1\Pat\LOCALS~1\Temp\lzvy9kl.exe
O4 - HKCU\..\Run: [Windows Resurections] C:\WINDOWS\TEMP\p8f6ft.exe
O4 - HKCU\..\Run: [reader_s] C:\Documents and Settings\Pat\reader_s.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKUS\S-1-5-21-1232489088-3827611932-3690280916-1006\..\Run: [] C:\DOCUME~1\Pat\LOCALS~1\Temp\lzvy9kl.exe (User '?')
O4 - HKUS\S-1-5-21-1232489088-3827611932-3690280916-1006\..\Run: [Windows Resurections] C:\WINDOWS\TEMP\p8f6ft.exe (User '?')
O4 - HKUS\S-1-5-21-1232489088-3827611932-3690280916-1006\..\Run: [reader_s] C:\Documents and Settings\Pat\reader_s.exe (User '?')
O4 - HKUS\S-1-5-21-1232489088-3827611932-3690280916-1006\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe (User '?')
O4 - HKUS\S-1-5-18\..\Run: [reader_s] C:\WINDOWS\system32\config\systemprofile\reader_s.exe (User '?')
O4 - HKUS\.DEFAULT\..\Run: [reader_s] C:\WINDOWS\system32\config\systemprofile\reader_s.exe (User 'Default user')
O4 - S-1-5-21-1232489088-3827611932-3690280916-1006 Startup: OneNote 2007 Screen Clipper and Launcher.lnk = C:\Program Files\Microsoft Office\Office12\ONENOTEM.EXE (User '?')
O4 - Startup: OneNote 2007 Screen Clipper and Launcher.lnk = C:\Program Files\Microsoft Office\Office12\ONENOTEM.EXE
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Program Files\Hp\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: Logitech SetPoint.lnk = C:\Program Files\Logitech\SetPoint\SetPoint.exe
O4 - Global Startup: Wireless-G Notebook Adapter.lnk = C:\Program Files\Linksys\Wireless-G Notebook Adapter\Gcc.exe
O8 - Extra context menu item: &MSN Search - res://C:\Program Files\MSN Toolbar Suite\TB\02.05.0001.1119\en-us\msntb.dll/search.htm
O8 - Extra context menu item: &Search - http://edits.mywebsearch.com/toolb [...] xdm429YYUS
O8 - Extra context menu item: Display All Images with Full Quality - res://C:\Program Files\NetZero\qsacc\appres.dll/228
O8 - Extra context menu item: Display Image with Full Quality - res://C:\Program Files\NetZero\qsacc\appres.dll/227
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~4\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_02\bin\npjpi150_02.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_02\bin\npjpi150_02.dll
O9 - Extra button: Send to OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~4\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: S&end to OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~4\Office12\ONBttnIE.dll
O9 - Extra button: Skype - {77BF5300-1474-4EC7-9980-D32B190E9B07} - C:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\Office12\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe (file missing)
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe (file missing)
O10 - Unknown file in Winsock LSP: c:\windows\system32\iavlsp.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\iavlsp.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\iavlsp.dll
O14 - IERESET.INF: START_PAGE_URL=http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iehome&locale=EN_US&c=Q305&bd=pavilion&pf=laptop
O16 - DPF: {37A273C2-5129-11D5-BF37-00A0CCE8754B} (TTestGenXInstallObject) - http://asp.mathxl.com/wizmodules/t [...] nstall.cab
O16 - DPF: {5C051655-FCD5-4969-9182-770EA5AA5565} (Solitaire Showdown Class) - http://messenger.zone.msn.com/bina [...] b56986.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/EN-U [...] E_UNO1.cab
O16 - DPF: {95D88B35-A521-472B-A182-BB1A98356421} (Pearson Installation Assistant 2) - http://asp.mathxl.com/books/_Playe [...] lAsst2.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (MSN Games - Installer) - http://messenger.zone.msn.com/bina [...] b56649.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/bina [...] b56907.cab
O16 - DPF: {C49134CC-B5EF-458C-A442-E8DFE7B4645F} (YYGInstantPlay Control) - http://www.yoyogames.com/downloads/activex/YoYo.cab
O16 - DPF: {E6D23284-0E9B-417D-A782-03E4487FC947} (Pearson MathXL Player) - http://asp.mathxl.com/books/_Players/MathPlayer.cab
O23 - Service: ASP.NET State Service (aspnet_state) - Unknown owner - C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\aspnet_state.exe (file missing)
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: AudioSrv - Unknown owner - C:\WINDOWS\TEMP\VRT7.tmp (file missing)
O23 - Service: BITS - Unknown owner - C:\WINDOWS\TEMP\VRT7.tmp (file missing)
O23 - Service: Browser - Unknown owner - C:\WINDOWS\TEMP\VRT7.tmp (file missing)
O23 - Service: CiSvc - Unknown owner - C:\WINDOWS\TEMP\VRT7.tmp (file missing)
O23 - Service: COMSysApp - Unknown owner - C:\WINDOWS\TEMP\VRT7.tmp (file missing)
O23 - Service: Logical Disk Manager Administrative Service (dmadmin) - Unknown owner - C:\WINDOWS\System32\dmadmin.exe (file missing)
O23 - Service: DvpApi (dvpapi) - Authentium, Inc. - C:\Program Files\Common Files\Authentium\AntiVirus\dvpapi.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: HP WMI Interface (hpqwmi) - Unknown owner - C:\Program Files\HPQ\SHARED\HPQWMI.exe (file missing)
O23 - Service: iolo FileInfoList Service (ioloFileInfoList) - Unknown owner - C:\Program Files\iolo\common\lib\ioloServiceManager.exe
O23 - Service: iolo System Service (ioloSystemService) - Unknown owner - C:\Program Files\iolo\common\lib\ioloServiceManager.exe
O23 - Service: iPod Service (iPodService) - Unknown owner - C:\Program Files\iPod\bin\iPodService.exe (file missing)
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Unknown owner - C:\Program Files\Common Files\LightScribe\LSSrvc.exe (file missing)
O23 - Service: LiveUpdate Notice Service Ex (LiveUpdate Notice Ex) - Unknown owner - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe (file missing)
O23 - Service: LiveUpdate Notice Service - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe
O23 - Service: Lexar JD31 (LxrJD31s) - Unknown owner - LxrJD31s.exe (file missing)
O23 - Service: Windows Installer (MSIServer) - Unknown owner - C:\WINDOWS\system32\msiexec.exe (file missing)
O23 - Service: NICSer_WPC54G - Unknown owner - C:\Program Files\Linksys\Wireless-G Notebook Adapter\NICServ.exe (file missing)
O23 - Service: Remote Procedure Call (RPC) Locator (RpcLocator) - Unknown owner - (no file)
O23 - Service: Smart Card (SCardSvr) - eMPIA Technology, Inc. - (no file)
O23 - Service: MS Software Shadow Copy Provider (SwPrv) - Unknown owner - C:\WINDOWS\system32\dllhost.exe (file missing)
O23 - Service: Performance Logs and Alerts (SysmonLog) - Unknown owner - C:\WINDOWS\system32\smlogsvc.exe (file missing)



Any possible help would be greatly appreciated.