I have been using Win 2k for the last few months, with both my CD-Roms working fine, 1 of which is a CD-RW. I had to format, and when I reinstalled Nero Burning ROM 5.5.1.8 (which was previously installed) they disapeared. They both still exist in device manager and they give the error: The registry may be corrupted (Code 19) (It may be not the true English message, but it's a free translation from French). I have tried removing the both of them and re-installing them, and the problem remains the same. If anyone has any idea's I would appreciate it. The only difference comes from the fact that Clone CD is not installed (which was previously). Thanks

I dont know if this will help as it deals with a usb cd-rw but it might work the same. The quirk happened after Win2K Pro was installed on a machine. If he hot-swapped a USB CD-ROM before its driver was installed on a machine with only one USB port—or on a machine where the second USB port was already in use—both the internal and USB CD-ROMs would not be available when the computer was restarted. In this article, I’ll take a closer look at the problem and explain Laun’s solution so that when this happens to you, you’ll be fully prepared. Can’t you hot-swap these things? Laun first became aware of this problem when a developer asked him about it several months before TechRepublic began its migration. The developer had a USB Zip drive connected to his HP Kayak XM600 at home, and when he plugged in a USB CD-ROM to his machine, installed the driver, and rebooted his computer, neither his new CD-ROM or the internal CD-ROM were available. Laun didn’t know what to tell him, except to say that he would try to keep an eye out for a fix. It wouldn’t be long before Laun was forced to find a solution. The same problem occurred early in TechRepublic’s migration to Win2K Pro. This time the system was a Compaq P866 that had a USB scanner plugged into its second port. This time, the employee encountering the problem had hot-plugged the USB drive in, installed the driver, and restarted the machine. He double-clicked My Computer and sure enough, there were no CD-ROM drives at D: or E:. When Laun right-clicked My Computer, clicked on Manage, and then clicked on Device Manager, he saw a caution mark under Universal Serial Bus controllers. See Figure A. Ted Laun also saw the computer’s internal drive marked with a caution sign. When Laun right-clicked the caution mark for the CD-ROM and then clicked on Properties, he saw that the computer could not find the driver for either drive. See Figure B. Note: In our tests, we could only lose the external drive. Laun suspects that the problem may have been at least partially fixed by Service Pack 1. In the device status box, Laun found an error Code 31. Looking for a solution in all the right places Laun did what you probably would have done—he uninstalled the drivers and reinstalled them. But that didn’t fix the problem. Both devices failed to show up under My Computer. Laun searched Microsoft’s TechNet and came up empty handed. Then he went out into the Usenet user groups and found that someone else had the same problem. Apparently, all he had to do was to Regedit into the Registry and kill out two keys. They are located at: HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} Once he was there, Laun deleted the UpperFilters and LowerFilters. When he rebooted the computer, the appropriate information appeared. See Figure C. . Now it’s an easy fix In late 2000, Laun was well into the migration to Win2K. For some reason, he had to plug a USB CD-ROM into a Compaq Armada M300, which only has one USB port. Again, both CD-ROM drives were unavailable on restart, and the computer indicated that the drivers were missing. Once again, the fix was deleting the two keys from the Registry, and both drives reappeared under My Computer.