You need to mount the CD-ROM before you can install OS3.9 from CD (I think you knew that already lol) So your next step is to use your Mad PC skillz to setup the HD and CD as Master and Slave, then install IDEFix 97 and mount the CD-ROM as device CD0: (It will be unit 1) This program is a demo but that is ok since OS 3.9 has it's own driver once it's loaded. So first things first: install OS 3.1 (if you don't already have it installed, get it on disks), then IDE Fix, after CD works install 3.9. Have fun.