Had licensed engineer downgrade the O/S on my nearly new HP Pavilion tower several months back from Vista to XP SP3. Never had to use DVD-RW until recently and it shows in Explorer as a CD-Rom. Factory installed device is HL-DT-ST DVD-RAM GH10L. It's a decent device with Lightscribe and reason I downgraded was lack of driver support and marginal functionality of my peripherals under Vista. Driver support from HP only available for Vista. Help!