ok well ive had ma vista pc about 2 -3 weeks i have a 160GB SATA drive and when i first installed vista and all the programs i have had used 22GB on the drive. Ive not installed a program since and tharefore all the files on the drive add up to 22GB (i store all documents on file server) ive just checked how much space is used on the drive after noticing it going down slowly more and more it says there is 47.5GB used now something is filling it up that doesnt show up in windows i presume it must be something like system restore or something but more than 20GB? Any ideas what it could be and how i stop it taking up so much?