If it is a bios virus, which i dont think it is(you probably have a faulty connector) REINSTALLING WINDOWS MIGHT NOT HELP. I've made a few viruses myself and i know that it is possible to create one that will create its own "partition..." However, that is VERY RARE, ive only seen one, so it is my guess that it is a connector problem... ive never heard of a virus that does such things... And it's VERY rare for a virus to survive without the OS it came to.
I suggest reinstalling windows again... MAKE SURE THERE ARE NO OTHER PARTITIONS. if you do this correctly,t he only other option will be that you have a FAULTY CONNECTOR FOR YOUR KEYBOARD.(ps2/usb, whatever)