Well, I've done the figurative "Burn it to ashes, then burn the ashes, then wash them down the garbage disposal, then Drain-O, then new plumbing" technique.
Programs involved:
Incinerator
Restore
Free Space Wipe
Recuva
Auslogics Disk Defrag
DiskTune
Actions taken:
1.) Individual file delete w/ gibberish overwrite
2.) Defrag
3.) Disk optimization
4.) Free space gibberish overwrite
5.) Free space "all zeros" overwrite
6.) Old user account deletion
7.) Deep scan for all old files (brought up a LOT I'd "erased" years ago
)
8.) Complete deletion of file names
9.) Uninstall almost every non-OS-required-program
By using these in the steps 1, 2, 1, 3, 4, 5, 3, 7, 6, 9, 3, 5, 4, 7, 8, 3, 5, and triple-checking with different programs after it was all said and done (about 10 hours total), it's squeaky clean. Runs a bit faster, too.
oem retail
If I thought this old thing could run Windows 7 with any proficiency, I've got a Wichita State student email address (knocking the price down to ~$30, IIRC).
Before this thread, I'd never even heard of deleted-file restoration, nor "free space wipers."
They seem to work pretty well, as long as you can get them to cover each others' tracks.