Hi Romeo,
kb936330 is listed as "Windows Vista Service Pack 1" - so it looks like MS is trying to get that unfortunate operating system you have into a usable state.
Take a look at the forum below, where it looks like some other people are having the same problem as yourself. It looks like this may take a long, long time to install, so it may be best to leave this do its thing overnight.
HELP KB936330 - Vista Forums
Cheers,
Martin.