DVD drive is not being recognized

i was attempting to start windows media center in a vista machine in order to play a dvd that i had just put in, when i received a blue screen notifying me of a windows error. before i could read the whole message the computer then restarted normally. only after rebooting i could not eject the dvd i had inserted (i had to do it manually) and no dvd drive shows up in the device manager... anyone know how can recover my dvd drive?

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