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I've never seen that one before!
Make sure the system is using the proper driver - I have seen cases where an old drive that had been replaces still showed up in the Device list, even after a new drive was installed and recognized.
On a Windoze9x/ME box, that's in Control Panel->System->Device Manager->CD ROM
Check that only the actual CD-ROM drive is listed, and check it in both normal mode and Safe Mode. Remove any obsolete or duplicate listings.
Having two devices listed when only one exists can seriously confuse the OS.