Help with CDRWin!

I deleted my Nero 4 to try Cdrwin and after installing Cdrwin, I tried to run the option Back up Disc and I got a message which read:-

No Cd rom recording device was found on the SCSI or IDE bus.

Can any body help me to get Cdrwin running on my PC, or can anybody tell me what I have done.

Thanks

Ruskee.