lost hard drive space - or is it?

[habann]

Hey Everyone, I'm having an "interesting" problem with my PC. It says that I have 80 gigs left on a 120 gig HD. The problem is, I've only had my computer for a month now, and there is no way I've used up 40 gigs worth of space. I used a HD scan - treesize - which shows I've only used about 10 gigs of HD space.

Does anyone know why there is this discrepancy between what the HD says I have left and what the HD scanner says I have. This problem is really annoying, since the computer seems to be telling me I'm losing about a gig of HD space a day. Yesterday it was 85, today it's 83.

[patio]

Where are you seeing the reported sizes ? ?
Easiest way would be to open Windows Explorer and see where th largest files are...

[habann]

where I'm getting the sizes is from clicking "properties" on the C drive, where it gives the quick breakdown of used/unused space.

[patio]

OK...
Did you try what was suggested yet ? ?