Windows 7 suddenly not genuine?

Booted my pc out of sleep mode yesterday, did some browsing on reddit, and out of nowhere a pop up from windows saying the (copy isn't genuine) asks me to validate/activate. I was confused, as I bought this pc with windows 7 pre-installed on it with a valid OEM key; it was the first thing I had checked after setting up the computer initially.

I did notice that the pc was originally shipped from dell with XP, but had a Vista upgrade sticker on the top. My guess was they upgraded it one last time before refurbishing and selling it, but didn't include the install disk or CoA key.

If i try to activate, it says "The Windows 7 professional product key you've typed is invalid for activation", even though I never tried to type the code in, as it wasn't included in the purchase.

I did also try Windows 10 through the free upgrade in july, but downgraded about 2 weeks after.
I also recently installed a new video card at the beginning of September if that may have messed with anything. Was an Nvidia pci-e to another Nvidia pci-e.

I updated my bios settings last night after noticing this problem as well, to no avail...

If there is anything I've missed, please let me know. I really don't want to buy 8.1 or 10 if it's not necessary.


Thank you for your time

Diagnostic Report (1.9.0027.0):
-----------------------------------------
Windows Validation Data-->

Validation Code: 50
Cached Online Validation Code: 0x0
Windows Product Key: *****-*****-788W3-H689G-6P6GT
Windows Product Key Hash: yr8OHoeXhbT4dc6MxGYjdAStSPY=
Windows Product ID: 00371-OEM-8992671-00008
Windows Product ID Type: 2
Windows License Type: OEM SLP
Windows OS version: 6.1.7601.2.00010100.1.0.048
ID: {A647B121-3EE9-49F0-B50E-51AAAE853CB5}(1)
Is Admin: Yes
TestCab: 0x0
LegitcheckControl ActiveX: N/A, hr = 0x80070002
Signed By: N/A, hr = 0x80070002
Product Name: Windows 7 Professional
Architecture: 0x00000009
Build lab: 7601.win7sp1_gdr.150722-0600
TTS Error:
Validation Diagnostic:
Resolution Status: N/A

Vista WgaER Data-->
ThreatID(s): N/A, hr = 0x80070002
Version: N/A, hr = 0x80070002

Windows XP Notifications Data-->
Cached Result: N/A, hr = 0x80070002
File Exists: No
Version: N/A, hr = 0x80070002
WgaTray.exe Signed By: N/A, hr = 0x80070002
WgaLogon.dll Signed By: N/A, hr = 0x80070002

OGA Notifications Data-->
Cached Result: N/A, hr = 0x80070002
Version: N/A, hr = 0x80070002
OGAExec.exe Signed By: N/A, hr = 0x80070002
OGAAddin.dll Signed By: N/A, hr = 0x80070002

OGA Data-->
Office Status: 103 Blocked VLK
Microsoft Office Enterprise 2007 - 103 Blocked VLK
OGA Version: N/A, 0x80070002
Signed By: N/A, hr = 0x80070002
Office Diagnostics: 025D1FF3-364-80041010_025D1FF3-229-80041010_025D1FF3-230-1_025D1FF3-517-80040154_025D1FF3-237-80040154_025D1FF3-238-2_025D1FF3-244-80070002_025D1FF3-258-3

Browser Data-->
Proxy settings: N/A
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Win32)
Default Browser: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
Download signed ActiveX controls: Prompt
Download unsigned ActiveX controls: Disabled
Run ActiveX controls and plug-ins: Allowed
Initialize and script ActiveX controls not marked as safe: Disabled
Allow scripting of Internet Explorer Webbrowser control: Disabled
Active scripting: Allowed
Script ActiveX controls marked as safe for scripting: Allowed

File Scan Data-->

Other data-->
Office Details: <GenuineResults><MachineData><UGUID>{A647B121-3EE9-49F0-B50E-51AAAE853CB5}</UGUID><Version>1.9.0027.0</Version><OS>6.1.7601.2.00010100.1.0.048</OS><Architecture>x64</Architecture><PKey>*****-*****-*****-*****-6P6GT</PKey><PID>00371-OEM-8992671-00008</PID><PIDType>2</PIDType><SID>S-1-5-21-1744941082-2886979951-3051333170</SID><SYSTEM><Manufacturer>Dell Inc.</Manufacturer><Model>OptiPlex 755 </Model></SYSTEM><BIOS><Manufacturer>Dell Inc.</Manufacturer><Version>A22</Version><SMBIOSVersion major="2" minor="5"/><Date>20120611000000.000000+000</Date></BIOS><HWID>C9E13407018400F8</HWID><UserLCID>0409</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>Mountain Standard Time(GMT-07:00)</TimeZone><iJoin>0</iJoin><SBID><stat>3</stat><msppid></msppid><name></name><model></model></SBID><OEM><OEMID>DELL </OEMID><OEMTableID>B9K </OEMTableID></OEM><GANotification/></MachineData><Software><Office><Result>103</Result><Products><Product GUID="{90120000-0030-0000-0000-0000000FF1CE}"><LegitResult>103</LegitResult><Name>Microsoft Office Enterprise 2007</Name><Ver>12</Ver><Val>ACD7202654E586</Val><Hash>fFic3JgCreGGRxyF8uMWB4R4Jcg=</Hash><Pid>89388-707-1528066-65846</Pid><PidType>14</PidType></Product></Products><Applications><App Id="15" Version="12" Result="103"/><App Id="16" Version="12" Result="103"/><App Id="18" Version="12" Result="103"/><App Id="19" Version="12" Result="103"/><App Id="1A" Version="12" Result="103"/><App Id="1B" Version="12" Result="103"/><App Id="44" Version="12" Result="103"/><App Id="A1" Version="12" Result="103"/><App Id="BA" Version="12" Result="103"/></Applications></Office></Software></GenuineResults>

Spsys.log Content: 0x80070002

Licensing Data-->
Software licensing service version: 6.1.7601.17514

Name: Windows(R) 7, Professional edition
Description: Windows Operating System - Windows(R) 7, OEM_SLP channel
Activation ID: 50e329f7-a5fa-46b2-85fd-f224e5da7764
Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f
Extended PID: 00371-00178-926-700008-02-1033-7601.0000-2692015
Installation ID: 006400575890372213378511416614362816084706855360042404
Processor Certificate URL: http://go.microsoft.com/fwlink/?LinkID=88338
Machine Certificate URL: http://go.microsoft.com/fwlink/?LinkID=88339
Use License URL: http://go.microsoft.com/fwlink/?LinkID=88341
Product Key Certificate URL: http://go.microsoft.com/fwlink/?LinkID=88340
Partial Product Key: 6P6GT
License Status: Notification
Notification Reason: 0xC004F063.
Remaining Windows rearm count: 4
Trusted time: 9/26/2015 12:47:16 PM

Windows Activation Technologies-->
HrOffline: 0x00000000
HrOnline: 0xC004C533
HealthStatus: 0x0000000000000000
Event Time Stamp: 9:26:2015 12:35
ActiveX: Registered, Version: 7.1.7600.16395
Admin Service: Registered, Version: 7.1.7600.16395
HealthStatus Bitmask Output:


HWID Data-->
HWID Hash Current: NgAAAAIABAABAAEAAAADAAAAAQABAAEAln20hUZvQNw67Iooki4orw5UKsOgg9q5J5R13UbK

OEM Activation 1.0 Data-->
N/A

OEM Activation 2.0 Data-->
BIOS valid for OA 2.0: yes
Windows marker version: 0x0
OEMID and OEMTableID Consistent: yes
BIOS Information:
ACPI Table Name OEMID Value OEMTableID Value
APIC DELL B9K
FACP DELL B9K
HPET DELL B9K
BOOT DELL B9K
MCFG DELL B9K
SSDT DELL st_ex
ASF! DELL B9K
____ DELL B9K
SLIC DELL B9K
SSDT DELL st_ex
SSDT DELL st_ex
SSDT DELL st_ex