When I boot up from CD-ROM to install Windows XP, everything goes normal until the part where you press ENTER to install Windows XP. When I press ENTER, setup shows that there are no hard disks in the computer! But there are working hard disks in the computer!

How do I solve this problem?
j0hn6oo, how am I supposed to format Drive C while Windows is running?
The hard drives are working perfectly fine! And I already have Windows XP installed. I just want to do a clean install.