I installed windows 7 beta and now i cant find 20 gigs of memory!? -

my windows vista had something wrong with it so i installed windows 7 beta and it put all my windows vista documents into a separate folder (this is after i backed up everything) and then i deleted the vista files. my hard drive is 140 gigs and after i deleted all my vista stuff there were 35 gigs still being used up. but when i go to the drive and highlight everything and it adds up to 10.5gigs. where did the 20 gigs go?!?! the hidden folders are visible and ive looked through them all but i cant find where those 20 gigs went. anyone have any ideas?

If you installed Windows 7 over Vista, you should have a folder named quot;Old Windowsquot; and all your Vista stuff will be in there