Compal notebook ... problem with dvd.

Question

accidentally installed an incorrect driver from what i can see. a sis udma driver. so i have primary and secondary ide plus a udma driver. the dvd/cd rom is no longer recognized.
My question.... did the dvd die (which seems possible) or would it just be a conflict with the udma driver.
operating sytem is xp pro
I will answer any other requests for information that is required as promptly as i can.

Thanks for your time.

Robert