For a Microsoft Windows XP version of this article, see Q314060 .

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs.

SYMPTOMS:
You cannot see or access your CD-ROMs in My Computer.
In Device Manager, the following error message occurs with all CD-ROM devices connected to your system:

The device is not working properly because Windows cannot load the drivers required for this device (Code 31).
The Device Manager displays the following error code message:

A driver for this device was not required, and has been turned off (Code 32 or Code 31).
NOTE: You may also receive an error code 39 message that indicates that the driver is corrupted.

The Device Manager displays the following error code message:

Your registry might be corrupted. (Code 19)
This code means that the registry returned an unknown result.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

There are two supported methods to resolve this issue.
Method One
Remove the "Upperfilters" and "Lowerfilters" values completely from the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
NOTE: If you are getting a code 39 message, it may be that additional third-party filter drivers were added to UpperFilters and LowerFilters values as well. To fix just remove the lowest "Upperfilters" and "Lowerfilters" entries completely from the following registry key and try to reboot: If this does not fix the problem, go ahead and remove the "Upperfilters" and "Lowerfilters" values completely from the above mentioned registry key:

Restart your computer.
Method Two
If the above method does not resolve the code 31 error message and restore access to your CD-ROMs, if you also have Media Player version 7.0 installed, you can uninstall Media player version 7.0 and download and install the latest release posted at the following Microsoft Web site:
http://www.microsoft.com/windows/windowsmedia

NOTE: There may be other third party CD-Writing Software that exhibit similar behavior. Some or all of these troubleshooting steps can apply to them if they also add entries under the UpperFilters or LowerFilters registry values by either adding their filter drivers or by removing the registry keys and values outlined in this article that start with:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
WARNING: Ensure you perform a backup of your registry before you make any changes.