I just signed up to Vista forums to reply to your problem. I've been having the same problem and been going nuts trying to fix it (kaspersky rescue disk full scan, reset windows update by editing reg ect) Well anyway, the solution was simple....I upgraded WindowBlinds!!! THAT WAS IT!!!! I can't blame them, that's what I get for using the beta version
I hope this will help many people with the same situation.
NOTE: just realized thet this post was dated 10/13/2008...not today, which is 10/13/2009!!!!
Anyway, it came up on google as one of the top search results for this error so I'm sure other people are likely to stumble across this page.