Q u o t e: Sorry for the late reply and here is the error message "Please insert the Diablo CD into your CD-ROM drive and press OK".
I recall a similar issue with D1 when there were several cd drives (any kind, real or virtual) in the system: I then had to assign the drive the D1 cd was in the highest character like Z: to satisfy the recognition routine.
Venture to the Realms Beyond to get off the beaten path.
http://realmsbeyond.net