I have an HP dv6500 laptop running vista 32 bit. When i purchased it (used) the device manager did not recognize the DVD drive. It blinked when a disk was inserted but the disk did not play. When I installed service pack 1, the drive was recognized and was fully functional. Then I installed service pack 2, and the drive disappeared again. It seems like it might be a driver problem, but I do not know how to search for the driver, as I don't know which drive this model has.