I just came across a VERY strange problem today. I've been running MCE 2005 for a bit now, and it's eating up hard drive space on my main drive slowly but surely.. not only this, but it's misrepresenting disk usage pretty badly. I've run XP Pro up until MCE for years and never EVER had this problem before.. Reference these comments with the screenshot below. 1) Doing a a disk space check within the XP gui reports 24 gigs used, but when I check the sizes of each of the ONLY four folders on my HD, it reports roughly 11 gigs used. This plus my 1.5g pagefile is 12.5 gigs. Where the heck are the other 12 gigs being used??? 2) doing a dir/a/s from the root directory on C:, it reports roughly 12.5 used as well (13,495..... used, bottom prompt window) 3) check the root directory to double check the pagefile size and anything else, 1.5g for the pagefile, nothing else fishy (1,610....., top prompt window) Now here's the really strange thing. I'm losing about a meg or more every second. If I sit at the prompt and do dir/a, every time my free space dwindles a bit. I had left my comp on for days before I first noticed this happening today, before I started investigating, until the point where I had 0 bytes free on C. Once I restarted, everything was peachy, although I had about six gigs less free than I remembered having before. I've now had my comp on for roughly 12 hours and have lost about 8 gigs. I'm sure when I restart I'll be good again. Nothing fishy running in the background, no viruses after exhaustive checking... what the heck's going on?? EDIT: Another thing you'll probably notice is that when doing the dir/a/s in the prompt window (bottom one), it's reporting about 24 gigs total disk space. It's a 40 gig drive (37 gigs), which you can see in the disk usage for C. Again, wtf?? :