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Start->Programs->Accessories->System Tools->System Restore.
Choose a restore point from the last time BEFORE you did the delete.
I don't know how you deleted 501 items from a read-only CD-ROM. It's not technically possible. I thought you meant you deleted it from the installed hardware device list.
If this fails, re-install WIndows.
Jim
1. Ensure that it is detected in the BIOS (providing, of course, that it is IDE)
2. Check that power is going to it and the motor is spinning (by pressing eject and putting a nice, clean disk in)
3. Go into device manager and delete all optical drives, then restart in normal mode. Windows will pick it up if it's there and working properly.
4. Take a chance of deleting all IDE controllers and rebooting to let Windows detect them.
Or, take it to your friendly, local PC shop.
you can't delete your CD ROM. It is not software, it is hardware