When you delete a file, it isn't really gone because Windows just marks the space they occupied as being available. Anyone with a restoration or undelete program could recover them, meaning that personal data could get into the wrong hands. This is bad news if you want to purge some sensitive data like old passwords, banking details, financial records or anything else.

Quick Erase can solve this problem and is an excellent choice for newly reformed pirates to destroy incriminating evidence. It allows you to completely remove sensitive data from your hard drive by overwriting it several times with carefully selected patterns. For some extra security, it will also rename the file and reset the date. Quick Erase has twelve deletion methods:

Quick - overwrites the file once with 0s
British HMG IS5 (Baseline) - overwrites the file once with 0s
British HMG IS5 (Enhanced) - overwrites the file 3 times
Russian GOST P50739-95 - overwrites the file twice
US Army AR380-95 - overwrites the file 3 times
DoD 5220.22-M - overwrites the file 3 times
DoD 5220.22-M (E) - overwrites the file 3 times
DoD 5220.22-M (ECE) - overwrites the file 7 times
Canadian RCMP TSSIT OPS-II - overwrites the file 7 times
German VSITR - overwrites the file 7 times
Bruce Schneier - overwrites the file 7 times
Rizonesoft developed method (PAYNE-3163H) which overwrites the file an impressive 23 times.

• DP Shredder 1.5
  Erase file / folder and overwrite disc free space. Use the following methode: 1.) ZERO 2.) Pseudoram Data 3.)RCMP (DSX) 4.) US DoD 5220.22-M (E) 5.) US DoD 5220.22-M...

• KaKa File Shredder 4.1
  File Shredder is an advanced security tool for Windows which allows you to completely remove sensitive data from your hard drive by overwriting it several times with US Dod 5220

• Secure Eraser 6.108
  Because it's been deleted from your hard drive, doesn't mean it's gone forever. As long as the information was not overwritten, anyone can restore it at any time. It gets even more complicated, if a computer has been resold or given away. Secure...