If you have the original operating system cd insert it in your cd rom and reinstall from there you will have to set your cd to be the first boot device this is done in the bios setup which can be accessed by pressing del on boot up then going to the second option down then setting the drive option then come out of the bios saving your settings then allow the pc to boot then the reinstall should begin have your product key at hand as you will have to enter it
Leslie Smith, November 2007