If you are running Windows Vista, you are running Windows Media Player 11. , you must know your Windows Media Player version. To verify that you are logged on to Windows with a user account that is a computer administrator, visit the following Microsoft Web site: To determine which version of Windows that you are running. To resolve this problem, locate and download the required codec.īefore you start, you must know which version of Windows your computer is running. When that happens, you might be unable to use Windows Media Player to play this particular.

In some cases, the file that you want to play uses a codec that is not available or compatible with the Windows Media Player. However, if the codec is not available on the server (for example, because the codec was not created by Microsoft), the Windows Media Player displays a message that your computer is missing a codec. If the codec is available, the Windows Media Player installs it on your computer and then plays the file. When you try to play a file that uses a codec that is not installed on your computer, the Windows Media Player tries to download the codec from a Microsoft server. When you play the video file, your computer must have a decompressor installed that can read that particular compression format.

When video files are created, they can be compressed to make the file size smaller by using a program (or compressor) that is installed on the developer's computer. This article is intended for a beginning to intermediate computer user. Unable to download an appropriate decompressor Error=80040200

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