all data stored on your harddrives are made of zeros and ones. if you truly want to destroy all data on the drive so NOONE can get it back then you need to get a program to write all zeros to a drive then all ones and then all zeros again so that all data will be erased and the drive is wiped clean for a new start as if it just came out of the factory. unless you know how to partition a drive and reinstall windows/linux/mac os do not try this because you have to reload everything. but the easiest thing to do is prevent viruses from infecting you computer, dont go to porn sites, dont download pirated software/music, and dont do anything that will attract attention on your computer. just my two cents from an avid rider and computer techy. actually the best preventative method is to just go out and ride or watch a movie instead of sitting at home on a computer. it is much more enjoyable than sitting at a computer doing illegal stuff.