In its stock form XP does not play movie DVDs. Your post didn't reveal what software you used to add this feature to XP but for now, try this -> VLC PLAYER at http://download.cnet.com/VLC-Media-Player/3000-13632_4-10267151.html
I've been helping a friend clean up his Windows XP PC and I've run into a problem I've never seen before.
We purchased a Samsung SH-S222A DVD RW drive and it "seemed" to install without problem on the PC. Windows XP doesn't identify the drive as having any problems in the Device Manager and, when we put data disks in the drive, autorun usually works.
However, we haven't been able to get the drive to recognize DVDs nor to play sound. This drive explicitly states that the analog audio port has been disable. But, that shouldn't be an issue since we'd use digital sound in any case.
Can anyone help me to understand what's going on? My friend would like to play movies on the PC but can't in the current state.