Computer does not recognize CD-RW or DVD-Rom drive
A couple months ago my mom's OS (Win ME) and hard drive bit the dust, so I took her shopping, got a new hard drive, and upgraded her to Win XP. When we put the XP disk in, the upgrade went fine, no problems. Ever since then, however, the computer does not recognize that it has a CD or DVD drive. It only recognizes its hard drive.
I have gone through disk manager to make sure the drives weren't just disabled, but as far as anything on this computer is concerned, the drives themselves don't even exist.
The drives came pre-installed with the computer when she bought it, so she doesn't have driver disks for them. I've gone through all the documentation she kept for the computer, but I can't even find the model numbers for the drives.
Any ideas on how to get them back and running?