I proposed a fix for the subject problem in tip 7078.
A frequent visitor proposes the following quicker / easier alternative:
1. Boot to the Recovery Console.
2. Navigate to the %SystemRoot%\System32\Wbem\Repository\FS folder.
3. Delete the INDEX.BTR and OBJECTS.DATA files.
4. Exit the Recovery Console.
5. Start Windows XP normally.
6. Reconfigure ICS and ICF settings because step 3 causes them to be reset to factory defaults.