Hard Disk Space Disappearing with Windows 7

[InfiniteLoop]

ugh

TreeSize Free - Quickly Scan Directory Sizes and Find Space Hogs

stop guessing and find out.

 

[JoshuaJay]

You did cleanup your shadow copies and system restore points, right?

Shadow copies yes. I don't use System Restore, never set it up (for the exact reason it's being mentioned on this issue here, it leaves tons of junk behind).