New W7 installed over a Vista OS...not an upgrade. Everything with the W7 OS is working properly but the hard drive is showing way too much "used" space (about 120GB). There are no other user programs or data loaded yet. I've used disk cleanup and thought that I had requested the removal of Windows.old. That file no longer shows when executing the Explorer. The W7 folder is showing about 11.5 GB which is about right. How can I clean the hard drive of extraneous data short of formatting the whole drive and reloading W7?