How to upgrade your DVD decoder?
If an upgrade is available for your DVD decoder program:
Click Start, click Run, type dvdupgrd /upgrade, and then press ENTER.
 After you run the dvdupgrd /upgrade command, you will be directed to the manufacturer's Web site where the upgrade is located. Follow the instructions on the Web site to obtain and install the upgrade for your DVD decoder program.
No upgrade is available or no DVD decoder is present
If an upgrade does not exist or if there is no DVD decoder present, obtain and install a decoder that is compatible with Windows XP. For more information about decoder providers, please view any of the following third-party Web sites:
ATI Technologies
http://ati.amd.com
CyberLink (PowerDVD)
http://www.cyberlink.com
InterVideo (WinDVD)
http://apps.corel.com/lp/ivi/index.html
MediaMatics (DVMatics)
http://www.national.com
MGI Software (SoftDVD)
http://www.roxio.com/en/products/index.jhtml
Ravisent (CineMaster)
http://www.sonic.com
How do I find a codec?
 When trying to find the right codec for a particular file, you can use the WMPlugins.com Codec webpage or other websites. Typically, you should start with WMPlugins.com first. Note that if you aren't able to find a codec on WMPlugins.com, it is possible that the codec you are looking for is not compatible with the Player, so you might not be able to use the Player for this particular file.
Use caution when installing codecs that aren't listed on WMPlugins.com or Microsoft.com, such as some of the free codec packs available on the Internet that claim to include codecs from a wide variety of companies or organizations. Incompatibilities are known to exist with some of the components in these codec packs that can cause serious playback issues in the Player and other players, lead to system corruption, and make it difficult for Microsoft Support to diagnose and troubleshoot playback issues. For these reasons, we strongly discourage you from installing these codec packs, and recommend that you remove them if you have installed them and you are having problems with the Player. Install only codecs, filters, or plug-ins from trusted, authorized sources, such as the website of the official supplier. Even then, use caution; many codec suppliers offer minimal customer support. Before installing any digital media components, set a system restore point. The restore point enables you to return to your original system configuration, if necessary.
If you get a message in Windows Media Player that says that your computer is missing a codec, you are probably trying to play, burn, or sync a file that was compressed by using a codec that Windows or the Player doesn't include by default. In many cases, you can download and install the missing codec by clicking the Web Help button in the error message dialog box.
If you know the name of the codec or its ID (known as a FourCC identifier for video codecs or a WaveFormat identifier for audio codecs), try searching the Internet. (The codec ID might be displayed in the search results on WMPlugins.com if the Player can identify which codec is missing.)
You also can use codec analysis tools to check which codec you are missing. Click here to get free codec analysis tools.
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