Microsoft KB Archive/315378

= All CD Devices Appear in Device Manager with Yellow Exclamation Marks =

Article ID: 315378

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q315378



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. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
You may find that none of your compact disc (CD) devices work, including CD-Recordable (CD-R) discs, CDs, and digital video discs (DVDs), and that all the devices are marked with yellow exclamation points in Device Manager.



RESOLUTION
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.

To resolve this behavior, follow these steps:  Remove or rename the following files in the C:\Winnt\System32\Drivers folder:

'''Cdralw2k.sys

Cdr4_2k.sys'''

 Start Registry Editor (Regedt32.exe). Locate and then remove the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Cdralw2k

 Locate and then remove the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Cdr4_2k

 Locate and then remove the following registry value:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}\LowerFilter

 Locate and then remove the following registry value:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}\UpperFilter

</li> Quit Registry Editor.</li> In the folder where you saved the registry fix file, right-click the file, and then click Merge.</li> Restart your computer, and then verify that you have access to your CD drives by using a standard audio or data CD.</li></ol>

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MORE INFORMATION
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