I bought a PC from a company and windows 2000 is already installed. I tried to reinstall windows 2000 but every time it boots up it always boot on hard drive. I changed the boot sequence on the BIOS to floppy and cd-rom and when it boot it seems like it reads on floppy and cd-rom bec. it light up but it will still boot on the hard drive. What should I do, PLEASE help.