Another Windows 7 has stopped being genuine

Hi,

I've had Windows 7 Ultimate x64 for over 2 years now, with no problems. I recently got a SSD and transferred my OS over, as one does, and that seemed to work fine for the last week or so, until tonight. Everything booted up fine, I downloaded the latest security update from Microsoft and spent some time browsing the web. On closing the browser, The background image was gone and the bottom right corner has "Windows 7 / Build 7601 / This copy of Windows is not genuine" in it.

I've gone through the MGA diagnostic thingy, results below. If it was moving to SSD, why did it work fine for over a week? I do hope you can help. Thanks for your time.

Code:

Diagnostic Report (1.9.0019.0):
-----------------------------------------
WGA Data-->
Validation Status: Invalid License
Validation Code: 50

Cached Validation Code: 0xc004c4ab
Windows Product Key: *****-*****-X92GV-V7DCV-P4K27
Windows Product Key Hash: aU2z1/fnhnLHmhBm699qYZT2E6s=
Windows Product ID: 00426-OEM-8992662-00400
Windows Product ID Type: 2
Windows License Type: OEM SLP
Windows OS version: 6.1.7601.2.00010100.1.0.001
ID: {4D44F910-AEEF-4811-9BF0-54011C75EB0A}(1)
Is Admin: Yes
TestCab: 0x0
WGA Version: N/A, hr = 0x80070002
Signed By: N/A, hr = 0x80070002
Product Name: Windows 7 Ultimate
Architecture: 0x00000009
Build lab: 7601.win7sp1_gdr.120830-0333
TTS Error: 
Validation Diagnostic: 
Resolution Status: N/A

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

WGA 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: 109 N/A
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:\Users\Sarky\AppData\Local\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>{4D44F910-AEEF-4811-9BF0-54011C75EB0A}</UGUID><Version>1.9.0019.0</Version><OS>6.1.7601.2.00010100.1.0.001</OS><Architecture>x64</Architecture><PKey>*****-*****-*****-*****-P4K27</PKey><PID>00426-OEM-8992662-00400</PID><PIDType>2</PIDType><SID>S-1-5-21-70313552-2085721574-1796717514</SID><SYSTEM><Manufacturer>To Be Filled By O.E.M.</Manufacturer><Model>To Be Filled By O.E.M.</Model></SYSTEM><BIOS><Manufacturer>American Megatrends Inc.</Manufacturer><Version>P1.40</Version><SMBIOSVersion major="2" minor="7"/><Date>20120511000000.000000+000</Date></BIOS><HWID>25DB3607018400FE</HWID><UserLCID>1809</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>GMT Standard Time(GMT+00:00)</TimeZone><iJoin>0</iJoin><SBID><stat>3</stat><msppid></msppid><name></name><model></model></SBID><OEM><OEMID>DELL  </OEMID><OEMTableID>QA09   </OEMTableID></OEM><GANotification/></MachineData><Software><Office><Result>109</Result><Products/><Applications/></Office></Software></GenuineResults>  

Spsys.log Content: 0x80070002

Licensing Data-->
Software licensing service version: 6.1.7601.17514

Name: Windows(R) 7, Ultimate edition
Description: Windows Operating System - Windows(R) 7, OEM_SLP channel
Activation ID: 7cfd4696-69a9-4af7-af36-ff3d12b6b6c8
Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f
Extended PID: 00426-00178-926-600400-02-6153-7601.0000-0142013
Installation ID: 019752572022580033240496225212802175160940638492591816
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: P4K27
License Status: Notification
Notification Reason: 0xC004F200 (non-genuine).
Remaining Windows rearm count: 4
Trusted time: 14/01/2013 02:09:47

Windows Activation Technologies-->
HrOffline: 0x00000000
HrOnline: 0xC004C4AB
HealthStatus: PASS
Event Time Stamp: 1:14:2013 01:56
WAT Activex: Registered
WAT Admin Service: Registered

HWID Data-->
HWID Hash Current: MAAAAAEAAwABAAEAAAACAAAAAQABAAEAln0mUTcOdMTCv+jt7pC0LoqbmvkfiJZj

OEM Activation 1.0 Data-->
N/A

OEM Activation 2.0 Data-->
BIOS valid for OA 2.0: yes
Windows marker version: 0x20001
OEMID and OEMTableID Consistent: yes
BIOS Information: 
  ACPI Table Name	OEMID Value	OEMTableID Value
  APIC			ALASKA		A M I
  FACP			ALASKA		A M I
  HPET			ALASKA		A M I
  MCFG			ALASKA		A M I
  SSDT			Intel_		AoacTabl
  AAFT			ALASKA		OEMAAFT 
  SSDT			Intel_		AoacTabl
  SSDT			Intel_		AoacTabl
  SSDT			Intel_		AoacTabl
  ASF!			INTEL 		 HCG
  BGRT			ALASKA		A M I
  SLIC			DELL  		QA09