How much memory do you have? How much do you have to allow Microsoft to work, it is a pig when it comes to memory, it needs at least two gigs of ram to operate. I get the same message on a Z800 that has two processors and 12 gigs of ram, it usually happens when Microsoft decides it wants to index my hard drives which usually happens daily. Check to see if it happens about the same time of the day and that could be your problem.
