I have a legitimate copy of Windows 7, which has previously worked on my brother's computer. A day after it was installed on mine, it says it's not valid
Diagnostic Report (1.9.0027.0):
-----------------------------------------
Windows Validation Data-->
Validation Code: 50
Cached Online 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: 6.1.7600.2.00010100.0.0.001
ID: {84366E97-4F0A-4D45-9B6A-C3CBA364291D}(1)
Is Admin: Yes
TestCab: 0x0
LegitcheckControl ActiveX: N/A, hr = 0x80070002
Signed By: N/A, hr = 0x80070002
Product Name: Windows 7 Ultimate
Architecture: 0x00000000
Build lab: 7600.win7_gdr.110622-1503
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: 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:\Program Files\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>{84366E97-4F0A-4D45-9B6A-C3CBA364291D}</UGUID><Version>1.9.0027.0</Version><OS>6.1.7600.2.00010100.0.0.001</OS><Architecture>x32</Architecture><PKey>*****-*****-*****-*****-P4K27</PKey><PID>00426-OEM-8992662-00400</PID><PIDType>2</PIDType><SID>S-1-5-21-717545998-2776590815-1870177598</SID><SYSTEM><Manufacturer>Dell
Inc. </Manufacturer><Model>Dell DM051 </Model></SYSTEM><BIOS><Manufacturer>Dell Inc.
</Manufacturer><Version>A05</Version><SMBIOSVersion major="2" minor="3"/><Date>20060331000000.000000+000</Date></BIOS><HWID>B7B83607018400FC</HWID><UserLCID>0409</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>Pacific
Standard Time(GMT-08:00)</TimeZone><iJoin>0</iJoin><SBID><stat>3</stat><msppid></msppid><name></name><model></model></SBID><OEM/><GANotification/></MachineData><Software><Office><Result>109</Result><Products/><Applications/></Office></Software></GenuineResults>
Spsys.log Content: 0x80070002
Licensing Data-->
Software licensing service version: 6.1.7600.16385
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: 00426-00178-926-600400-02-1033-7600.0000-2632011
Installation ID: 008574693995852732638535682900713181316096676636418471
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: 3
Trusted time: 9/21/2011 11:11:49 PM
Windows Activation Technologies-->
HrOffline: 0x00000000
HrOnline: 0xC004C4AB
HealthStatus: 0x0000000000000000
Event Time Stamp: 9:21:2011 21:18
ActiveX: Registered, Version: 7.1.7600.16395
Admin Service: Registered, Version: 7.1.7600.16395
HealthStatus Bitmask Output:
HWID Data-->
HWID Hash Current: NgAAAAIABAABAAIAAAABAAAAAgABAAEAeqiyLjbo7Dfa+ypnqnZI5KYQxBh4rKC9AuQHYuw7
OEM Activation 1.0 Data-->
N/A
OEM Activation 2.0 Data-->
BIOS valid for OA 2.0: yes, but no SLIC table
Windows marker version: N/A
OEMID and OEMTableID Consistent: N/A
BIOS Information:
ACPI Table Name OEMID Value
OEMTableID Value
APIC DELL
DM051
FACP DELL
DM051
HPET DELL
DM051
BOOT DELL
DM051
MCFG DELL
DM051
SSDT DELL
st_ex
ASF! DELL
DM051
