That's odd...I had a Ricoh when I had that same problem.
Try downloading the drivers from
HERE. *NOTE* This is the same site that I got my drivers from a while ago. You'll have to view some "free adds" to get the drivers.
You might have to unplug your CD drive, restart your computer, then install the drivers, then shut your computer down, plug in your CD drive and finally restart your computer.
Hope this works for you!