Be aware that the CD-ROM might not be an IDE drive. Check the sound card and make sure IDE is printed next to the connector. It may be a different interface, even if it uses the same 40 pin cable as IDE -- it could be SCSI, Panasonic, or Sony/Mitsumi.
Check the Windows for Workgroups CD and see if there is a drivers folder that might have the correct driver -- there may also be a utility to make a boot disk. Or if there is an example config.sys and autoexec.bat file it might show you what is needed to make a dos boot disk work.
This page has some useful information including many driver file names, and links to manufacturer's web sits to get drivers:
http://www.computerhope.com/help/cdrom.htm