Without knowing the make/model/connection of the CDROM drive, you would try other boot disks from http://www.bootdisk.com
I have an older computer that I am trying to install Windows 95 to. When I turn on the computer with the diskette and cd disk in I come to a: prompt. When I try to go to d: invalid drive specification comes up. Can anyone help me get to d: from the a:? Thanks for any help.