How to Check if DVD Decoder Software is Installed

By default, Windows XP does not come with compatible DVD decoder software installed. To confirm if you have Windows XP-compatible DVD decoder software on your system:

Select Start > Run
Enter cmd in the Open box, and click OK
Type dvdupgrd /detect and press Enter

A Windows dialog box will open with identifying information about the installed software. If No decoders found is displayed, no decoder is installed