Alright, I've searched these forums and a number of others and haven't found a solution to my exact problem. Basically what is happening to me is my C Drive where Windows 7 is installed is only saying I have 28gb's of harddrive space left (on a 100gb partition) yet when I've run treeview it says I've only used up 48gb's, so I should have around 50gb's free. I've deleted all my restore points and even turned it off, to no avail. I've run Norton Antivirus and Malwarebytes which haven't found any problems. I've also run disk cleanup, chkdsk and CCleaner which didn't help. Reseting the computer also won't bring any of the hardrive space back, and neither does emptying the recycle bin or the recycler folder. I am running a clean install of Windows 7 Ultimate 64-bit edition, so there are no remnants of any old versions of windows on my C Drive. This is the second time I've reformatted my harddrive completely and reinstalled windows cleanly, and I'm still having the same problem. If anyone could offer any more suggestions it would be very much appreciated.