You must have dvd decoding software installed that's compatible with the os before your drive will be able to play dvd disks.
DVD decoding software written and designed for older Windows os's like 98/ME will not work in the newer Windows XP os.
Same goes for device drivers.... Windows XP os requires Windows XP drivers... Not all devices are supported in Windows XP and not all manufacturers provide Windows XP drivers.... sometimes they leave that up to Microsoft. If neither the manufacturer nor Microsoft provide support for a hardware device, it's very difficult to find 3rd party drivers that are free.
