DVD-ROM Issues

Running Windows XP Pro, Pioneer 160s DVD-ROM, GeForce3 Nvidia chipset with latest drivers on all. DVD player will not play DVDs. Audio CDs and data CDs are fine. Used a total of three media players (Windows Media Player 8 and 10, Interactual also), same result. Have already played with display settings, reboots multiple DVDs, checked physical connections. Device will read a DVD-ROM’s contents (e.g. I can explore the contents of the CD), but when trying to play the DVD, it gives black screen, no audio. Causes an application hang event in Windows application log. Any ideas would be extremely useful and appreciated.