Noel, thanks for your help. The Check disk said the disk was clean, and I did not get any error messages on SFC/SCANNOW (nor did it ask for my Windows XP CD--which I have, just in case.)
However, I ran the Genuine Check again after all that (and the reboot) and it came back with the same error message. What's next?
Here's the MGADIG report:
Diagnostic Report (1.9.0027.0):
-----------------------------------------
Windows Validation Data-->
Validation Status: Genuine
Validation Code: 0
Cached Validation Code: N/A
Windows Product Key: *****-*****-2MDY9-F6J9M-K42BQ
Windows Product Key Hash: jY+nlE0RT38EEXpeUqSdQPABSQc=
Windows Product ID: 76487-OEM-2211906-00101
Windows Product ID Type: 2
Windows License Type: OEM SLP
Windows OS version: 5.1.2600.2.00010100.3.0.pro
ID: {D3CDB26B-49C6-49B7-84E6-42C253B4C2F8}(3)
Is Admin: Yes
TestCab: 0x0
LegitcheckControl ActiveX: Registered, 1.9.42.0
Signed By: Microsoft
Product Name: N/A
Architecture: N/A
Build lab: N/A
TTS Error: N/A
Validation Diagnostic: 025D1FF3-230-1
Resolution Status: N/A
Vista WgaER Data-->
ThreatID(s): N/A
Version: N/A
Windows XP Notifications Data-->
Cached Result: 0
File Exists: Yes
Version: 1.9.40.0
WgaTray.exe Signed By: Microsoft
WgaLogon.dll Signed By: Microsoft
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: 025D1FF3-230-1
Browser Data-->
Proxy settings: N/A
User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Win32)
Default Browser: C:\Program Files\Mozilla Firefox\firefox.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>{D3CDB26B-49C6-49B7-84E6-42C253B4C2F8}</UGUID><Version>1.9.0027.0</Version><OS>5.1.2600.2.00010100.3.0.pro</OS><Architecture>x32</Architecture><PKey>*****-*****-*****-*****-K42BQ</PKey><PID>76487-OEM-2211906-00101</PID><PIDType>2</PIDType><SID>S-1-5-21-1917378478-2059684239-1522493254</SID><SYSTEM><Manufacturer>Hewlett-Packard</Manufacturer><Model>HP
Z800 Workstation</Model></SYSTEM><BIOS><Manufacturer>Hewlett-Packard</Manufacturer><Version>786G5 v03.13</Version><SMBIOSVersion major="2" minor="6"/><Date>20101013000000.000000+000</Date><SLPBIOS>Compaq,Hewlett,Hewlett,Compaq</SLPBIOS></BIOS><HWID>240833EF01840774</HWID><UserLCID>0409</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>Eastern
Standard Time(GMT-05:00)</TimeZone><iJoin>0</iJoin><SBID><stat>2</stat><msppid></msppid><name>Hewlett-Packard</name><model>HP Z800 Workstation</model></SBID><OEM/><GANotification><File
Name="WgaTray.exe" Version="1.9.40.0"/><File Name="WgaLogon.dll" Version="1.9.40.0"/></GANotification></MachineData><Software><Office><Result>109</Result><Products/><Applications/></Office></Software></GenuineResults>
Licensing Data-->
N/A
Windows Activation Technologies-->
N/A
HWID Data-->
N/A
OEM Activation 1.0 Data-->
BIOS string matches: yes
Marker string from BIOS: AE18:Compaq Computer Corporation|16755:Compaq Computer Corporation|1FFEA:Compaq Computer Corporation|B318:Compaq Computer Corporation|11983:Compaq Computer Corporation|11983:Compaq Computer Corporation|1FFEA:Hewlett-Packard Company|B318:Hewlett-Packard
Company|16D42:Philips Medical Systems
Marker string from OEMBIOS.DAT: Compaq,Hewlett,Hewlett,Compaq
OEM Activation 2.0 Data-->
N/A
HudsonWest
