Well, I really can't tell from your description what exactly you have done. Are you trying to put the hard drive from the broken computer into your other computer as a second drive? Is the XP OS your current operating system in your Working computer? or is that from the broken computer?. If you can't see the drive in the bios, there are several possibilities. How big is the drive? How old is the computer you're trying to put it into? If you're adding it as a second drive, you probably need to reset the drive jumpers on the drive itself to clear a conflict. If it's a big drive and you're putting it into an old PC, your pc's bios may not be able to read drives that big. Give more specifics, and perhaps we can give you more explicit answers.