I was installing Windows Vista SP1 today and got the following error:

Needless to say, even if I somehow get this installed, I will not be hoping for anything.

P.S: Looks like these guys do not want users to actually go to that link. Its neither selectable nor a hyperlink !

UPDATE: Turns out that link is actually useless. Just asks you to restart your system and/or run some stupid diagnostic tools to fix the problem. Seems like they do not know anything about this error.

ANOTHER UPDATE: Thanks to Bandan for the link from windowsreference.com. I was able to install Vista SP1. Not all the steps in that article might work. Here is what you need to do:

1. Reinstall windows update agent
   • Windows, x86-based systems download from here
   • Windows, x64-based systems download from here
2. Save it on your disk and run from a command prompt adding “/wuforce” at the end of the command.
3. Install Vista SP. It should install this time. It will take approx 30 mins to install and will restart your computer multiple times.