theog: good advice
bensabat: more information on the error: Windows Update error 800736CC
Quote: Originally Posted by Microsoft
If you receive Windows Update error 800736CC while installing updates, it's usually because the update content isn't valid and could be corrupted. This most likely is the result of a disk error. To resolve the problem, follow the steps in the sections below: check for disk errors first, and then remove the temporary update files that Windows uses to identify updates for your computer. To remove the temporary files, stop the Windows Update service, delete the temporary update files, restart the Windows Update service, and then try to check for Windows updates again.