I need a program or instructions on zero out a hard drive becuase my computer will not run any programs. The only thing that wors properly are the startup menus such as the f12 boot menu and f2 system setup (So far those are the only startup menus I have been on). If I start Windows regularly it will load with huge lag and also many error message popups. Tried to run AV programs but it only got worse. I need to know how to wipe my hard drive clean. I have a dell dimensions 8400.