Windows 7 SP1 - Error 80073712

I have obtained the Error with code: 80073712 yesterday while installing Service Pack 1 of Windows 7. I have no idea what was causing the problem, I have fixed it by installing the following update:

http://support.microsoft.com/kb/947821

After installation of this pack, SP1 installed without problems.

Also I have run the System File Checker, which found some errors, repaired them, but also found some errors which he could not repair. So I don't know if it contributed to the fix of the problem.

http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/system_file_checker.mspx?mfr=true