Spybot Search and Destroy has a secure file shredder. You can choose how many times you wish the program to over write the data. However I don't think it uses the Gutmann technique, which makes the data unrecoverable supposedly. Obviously, if you have a lot of data to destroy this will take a VERY long time and cause a considerable amount of wear and tear on the harddrive. Certainly the average person should not have to go through these extreme measures to delete data, unless you plan on selling or giving your pc away to someone who has some very expensive equipment, a lot of time, and a strong motive to find out what is on your computer.