Article ID: 2619822
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When you try to create a DVD by using Windows DVD Maker in Windows 7, you receive an error message that resembles the following:
Invalid Class String
This issue may occur because some registry keys were damaged during the installation of DirectShow drivers.
Almost all media applications install their own DirectShow drivers. Many different driver packages are available on the Internet, and some registry keys might become damaged during driver installation.
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:
322756To resolve this problem, use one of the following methods:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Method 1: Delete two registry keys
Method 2: User System Restore
For more information about how to troubleshoot this error, visit the following Microsoft CommunityForum website:
Cannot Create DVD__Invalid Class String