For sensitive material eg: Medical and Social Security Data too be scrubbed clean and Unrecoverable.
I would visit iolo.com and then I would download the Free Trial of Drive Scrubber.
I suggest that you Scrub the Free Space first, that's because when you add/Remove & Delete it all goes their.
Secondly, I would then Scrub C: Drive. On the settings before you start change too higher settings for the scan, it will be slower too complete but much more thorough. then I would chage the 1 oerwrite too 100 (as far it will go.) Then the computer will be fully wiped cleaned.
Their ios another way and it will not take ver long.
If it is Windows 7 or Windows Vista you canpurchase or if you have the Installation disk ready, you can fully restore your computer too factory reset. This is the best way and the fastest way. Then you can re-install Windows and it will be clean for someone else too use.
I hope this has given you the necessary information you needed.
I want to sale a couple of older pc's for a friend. She works in the medical field, and has a lot of sensitive info on these....social security numbers, patient files, etc. Is there a program that I can buy to wipe the drive completely clean, where NO ONE can access this info? Thank you