I just got one of our movie DVDs and it won't play either ..
so i did find this from microsoft -
[3. If prompted, click Play DVD Video using Windows Media Player and select the Always do the selected action check box. Then click OK.
Note: If the Play DVD Video option does not appear, your computer does not have the required software installed. Check your computer manufacturer's Web site for software you can download. Alternatively, you can purchase and install a DVD Decoder plug-in for Windows Media Player.]
http://www.microsoft.com/windowsxp/u...grams/dvd.mspx