So i just got my laptop its a compaq presario and it came with 138gigs. Initially it came with around 119gigs and after awhile i started to see that it started to decrease like around a gig aday or when i left it on to long. I took it in and geek squad and they said i had a virus but i restored it and nothing on my trendmirco has detected anything. I run proccess explorer and i cant see anything weird that is poping up using alot of CPU and now after i restored it twice i think its slowly doing it again but i heard that Vista uses alot of memory stored in cache called superfetch is this the reason why i see the decrease when im doing something on the system or what is serverpack 2 the guy kept telling me that this could be the case also. Please help im trying to understand all of this