http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_update/unable-to-install-service-pack-1-on-windows-7-x64/9b4b10ac-2ab6-42c2-a4aa-8c3549574be4

http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_update/unable-to-install-service-pack-1-on-windows-7-x64/9b4b10ac-2ab6-42c2-a4aa-8c3549574be4