Win7 MAK license reporting Genuine Adv failure

Hi, all!  Machine in question is Windows 7 Professional, latest patches (but not SP1).  Install base is approximately 40 machines with same MAK license key as the machine in question.

On this particular box, Windows is intermittently reporting a Microsoft Genuine Advantage error (nothing to capture).  The original license key was verified as valid.  I have since installed a different, known-valid license key.  The error is still popping up intermittently, but getting more frequent (couple times a week).  This machine was in service for 8 months with no issue before the Genuine Advantage error started popping up.  Tested the license with the MS Genuine Advantage test page (http://www.microsoft.com/genuine/diag) and all test passed.  Ran the MGADiag tool and the results are posted below; all is valid.

Suggestions?  Cannot wipe machine.  Thanks!
SteveB

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

Validation Code: 0
Cached Online Validation Code: 0x0
Windows Product Key: *****-*****-*****-*****-X87DY
Windows Product Key Hash: 1SqZNrX7XtteitWIj/SZEcBJea4=
Windows Product ID: 55041-011-1343055-86849
Windows Product ID Type: 6
Windows License Type: Volume MAK
Windows OS version: 6.1.7600.2.00010100.0.0.048
ID: {E186D910-67C6-4851-BD16-3246CAF03319}(1)
Is Admin: Yes
TestCab: 0x0
LegitcheckControl ActiveX: N/A, hr = 0x80070002
Signed By: N/A, hr = 0x80070002
Product Name: Windows 7 Professional
Architecture: 0x00000000
Build lab: 7600.win7_gdr.100618-1621
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: B4D0AA8B-604-645_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\Internet Explorer\iexplore.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>{E186D910-67C6-4851-BD16-3246CAF03319}</UGUID><Version>1.9.0027.0</Version><OS>6.1.7600.2.00010100.0.0.048</OS><Architecture>x32</Architecture><PKey>*****-*****-*****-*****-BBBBB</PKey><PID>55041-011-1343055-86849</PID><PIDType>6</PIDType><SID>S-1-5-21-1000555796-2136434629-582486733</SID><SYSTEM><Manufacturer>Hewlett-Packard</Manufacturer><Model>HP Compaq 6000 Pro AiO Business PC</Model></SYSTEM><BIOS><Manufacturer>Hewlett-Packard</Manufacturer><Version>786H8 v01.02</Version><SMBIOSVersion major="2" minor="6"/><Date>20100624000000.000000+000</Date></BIOS><HWID>85BB3607018400F8</HWID><UserLCID>0409</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>Pacific Standard Time(GMT-08:00)</TimeZone><iJoin>1</iJoin><SBID><stat>3</stat><msppid></msppid><name></name><model></model></SBID><OEM><OEMID>HPQOEM</OEMID><OEMTableID>SLIC-CPC</OEMTableID></OEM><GANotification/></MachineData><Software><Office><Result>109</Result><Products/><Applications/></Office></Software></GenuineResults>  

Spsys.log Content: 0x80070002

Licensing Data-->
Software licensing service version: 6.1.7600.16385

Name: Windows(R) 7, Professional edition
Description: Windows Operating System - Windows(R) 7, VOLUME_MAK channel
Activation ID: 9abf5984-9c16-46f2-ad1e-7fe15931a8dd
Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f
Extended PID: 55041-00172-011-134305-03-1033-7600.0000-1042011
Installation ID: 022295279110479594387476566345892824174005971281882432
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: X87DY
License Status: Licensed
Remaining Windows rearm count: 2
Trusted time: 4/19/2011 1:18:02 PM

Windows Activation Technologies-->
HrOffline: 0x00000000
HrOnline: 0x00000000
HealthStatus: 0x0000000000000000
Event Time Stamp: 4:13:2011 20:36
ActiveX: Registered, Version: 7.1.7600.16395
Admin Service: Registered, Version: 7.1.7600.16395
HealthStatus Bitmask Output:


HWID Data-->
HWID Hash Current: MAAAAAEAAQABAAMAAAABAAAAAgABAAEA6GFS3frUGBZ4dXiElCQIQaoU5urUpEbK

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                  COMPAQ            EAGLLAKE
  FACP                  COMPAQ            EAGLLAKE
  HPET                  COMPAQ            EAGLLAKE
  MCFG                  COMPAQ            EAGLLAKE
  ASF!                  COMPAQ            EAGLLAKE
  TCPA                  COMPAQ            EAGLLAKE
  SLIC                  HPQOEM            SLIC-CPC