Symantec Ghost Boot CD

We have a Dell GX620 with no 3 1/2 floppy disc “A” drive, only a cd drive, and we need to create a bootable cd for Symantec Ghost version 7.5. We tryed copying or 3 1/2 floppy ghost files that we use to boot gx620’s that have floppy drives to a cd and booting from cd but that doesn’t work. Any suggestions?