For the past 2 months I have noticed that everytime I use my PC, free space in the drive in which Windows XP-SP2 is loaded keeps reducing (by 0.1Gb for 4-6 hrs of working on the comp) without me adding anything. I reformatted that drive but the problem persists. I regularly delete cookies and temporary internet files. Updated antivirus (Avast and Clamwin) does not detect anything. Please suggest a solution.