Hello,
It happens on XP & Vista.
So it doesn't really matter. So the whole i'm glad vista crashed im back on XP. Doesn't really solve anything.
Unless you rebuild your PC with XP. (althou rebuilding with either OS fixes it also sometimes.)
Here is a nice fix.
should do it for you, Aimed at XP. Althou i thing the folders r in same location in vista also.
Windows svchost fix.
http://www.hardwareoholic.co.uk/content/view/39/1/
IT happens when windows searches for updates. so disable automatic updates work fine. If u go do manual up date same issue appear but the link above should fix it.