Digital Media Converter Pro has been enhanced to not only give you 'More Information' on why the file did not get added but also suggest ways to help you add the file for conversion. This troubleshooting section discusses the messages you may receive when trying to add files for conversion.

Most of the common file adding problems can be solved in one of the following ways:

Make sure you have the latest version of DirectX. Often installation of other video programs brings with it incompatible decoders that can cause Digital Media Converter Pro to fail. You can try reinstalling the latest version of DirectX. You may download the latest version of DirectX from: http://www.microsoft.com/windows/directx/default.aspx?url=/windows/directx/downloads/default.htm
Make sure you have Windows Media Player 9 or higher installed. To download Windows Media Player Series 9, visit http://www.microsoft.com/windows/windowsmedia/player/9series/default.aspx
If none of the above solutions work, you can look into the more specific messages given below or visit Digital Media Converter Pro Support Forum at http://www.deskshare.com/forums/default.aspx

Unable to read, Access Denied: Windows is refusing access to the file. Check that the file is not owned by a different user, and that Windows security settings do not forbid you to read the file.

Unable to load the file: The file could be corrupted, or may contain audio and/or video streams not supported by Digital Media Converter Pro.

Invalid OS for DVR-MS conversion or Invalid DirectX version: DVR-MS conversions require both Windows XP or later, and DirectX version 9.0 or later. DVR-MS conversions do not work on Windows Server 2008 PCs.

This file is not a valid media format. It does not contain audio/video streams: This error appears when the selected file is not a video or audio file. One common cause of this is trying to import a Flash movie (SWF) which is interactive.

Unable to find Audio Device, Audio Hardware Problems or Audio Drivers are not present: These errors appear if the Windows Audio service is not started. By default, this service is turned off in Windows Server 2008, and it can be stopped in other versions of Windows.

To fix this problem, start the Windows Audio service. You can do this by clicking Start >> Control Panel >> Administrative Tools >> Services. (You may have to switch the Control Panel to Classic View to find the Administrative Tools.) If you have set your Start menu to "Classic Start Menu" the sequence is Start >> Settings >> Control Panel >> Administrative Tools >> Services.

In the list of services, find the Windows Audio service, and double-click on it. In the Settings window that appears, set the Startup Type to Automatic.

Read the article: Troubleshooting Compatibility Issues