Worked on my Dell-OPTIPLEX(600MHTZ).
I couldn't put a big harddrive in.(It wasn't recognized by the bios)
Only had "BIOS VERSION A07."
Download the file to your puter,Then open it and it will ask for afloppy disk.After thats done just put it in your puter(it will work if your bios is set to read FLOPPY first).If not you can get in your bios = F2
FIXED my big Hard drive problems.