If you don't want to reformat the complete drive this is what I would do:
Dowload and install CCleaner
. Under the Cleaner
setting check all the boxs (windows and application). Then go Options
and select Secure File Deletion (7 passes)
. Then go Cleaner
and Run Cleaner
and let it do its thing.
Then download and install Eraser
's post above). Run Eraser and have it erase all the unused space on the hard drive (select File
, New Task
Then defrag your hard drive.
Then run Eraser