You upgrade a computer to Windows Vista or install Windows Vista Service Pack 1 or you install or uninstall applications that have a CD/DVD filter driver. When you restart the computer, the CD drive or DVD drive no longer works as expected.

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This problem may occur if one of the following scenarios is true:

•	The filter drivers in the CD and the DVD storage stack are not migrated successfully to Windows Vista.
•	You uninstalled CD software that fails to properly remove itself in the registry.
•	You installed software that adds filter drivers in the CD and the DVD storage stack that interfere with existing filters.

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

To resolve this problem, remove the affected filter drivers. To do this, follow these steps:

1.	Click Start, type regedit in the Start Search box, and then click regedit in the Programs list. If you are prompted for an administrator password or confirmation, type your password, or click Continue.
2.	Locate, and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} Caution There can be many instances of the registry subkey that is mentioned in step 2. You must make sure that you are in the appropriate registry subkey before modifying the UpperFilters and the LowerFilters values. To verify that you are in the appropriate registry subkey, make sure that the Default data value is DVD/CD-ROM and the Class data value is CDROM.
3.	In the right pane, right-click UpperFilters, and then click Delete.
4.	Click Yes to confirm the removal of the UpperFilters registry entry.
5.	In the right pane, right-click LowerFilters, and then click Delete.
6.	Click Yes to confirm the removal of the LowerFilters registry entry.
7.	Exit Registry Editor, and then restart the computer.

Note After you remove the UpperFilters registry entry and the LowerFilters registry entry, you may lose functionality in certain programs such as CD recording programs. In this scenario, you must reinstall any affected programs. If the problem recurs, contact the program vendor to determine whether an update is available for the program.

For information about how to contact computer software vendors, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

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For more information about the filter drivers that may be loaded in Windows Vista, run the DevCon program. To do this, follow these steps:

1.	Obtain and extract the DevCon program. For more information about how to obtain this program and about how to use this program, click the following article number to view the article in the Microsoft Knowledge Base: 311272 (http://support.microsoft.com/kb/311272/) The DevCon command-line utility functions as an alternative to Device Manager
2.	Click Start, type cmd in the Start Search box, right-click cmd in the Programs list, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type your password, or click Continue.
3.	At the command prompt, change the directory to the directory to which you extracted the DevCon files.
4.	Type devcon stack gencdrom, and then press ENTER.

Then, information that resembles the following appears:

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For more information about a similar problem that you may experience on a computer that is running Microsoft Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:

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