Hey,
My free space on partition C is dropping automatically, it's now about 11 MB
although i'm using only about 30-40 GB from 58 GB....i made a scan from viruses and i didn't find any thing..
Thanx...
Open up the task manager and see if there are any processes you don't recognize. Also you could try to find a program (I've heard of several, never used them though) that tells you what folder(s) are using the most space on your hard drive.