You can do anything to fix it and it relates to Windows update getting its knickers in a knot.
In some cases Ive found thatinstalling Hotfix for Windows (KB947821) sometimes helps. Its the only thing Ive found that avoids a complete OS reinstall.
- Download the right KB for your OS http://support.microsoft.com/?kbid=947821#method2
- Run the Microsoft Update Readiness Tool on the problematic computer.
- You open the %Systemroot%\Windows\logs\CBS\Checksur.log file after the scan was completed. this shows you what is the problem.
- Most of the time if you run windows update normally after a reboot all comes right.
- If not then check corrupt information in the files. Here are some samples at the bottom of this post on how to manually fix them: