I have have a drive monitor gadget on my windows 7 home premium x64 sp1 machine and last night there was about 200 gbs free on my Terabyte harddrive. And then when I turned it on earlier (about 14 hours later) I noticed that I only had 1% left on it. What could be taking up space. I am not downloading anything, I tried using CCleaner to free up space the then something just fills the space back up. I have Agent Ransack and it isn't showing any particular large files that where created since then. I have Combo firewall and Avast running all the time. I did a boot scan with Avast and everything came back clean. I am about to do a scan with Malwarebytes Anti-Malware. Please help!