http://blogs.technet.com/perfguru/archive/2008/07/18/windows-update-failing-torubleshooting-steps.aspx1) Windows update can fail due to many reasons.But as an initial troubleshooting step we can run script givenbelow. The following script will re-register windows update dlls and recreate software distribution & catroot folder. To run the script pleaseen-USCommunityServer 2.1 SP1 (Build: 61025.2)