i poped in a dvd into the dvd drive and it was playing but every couple of minutes an error message was coming up saying that the dvd drive had encountered a problem and needs to turn of. so i cliked not to send the report to microsoft and it countinued playing the movie. so i opened the task manager and tried ending the task and it wouldn't so i went to the Processes tab and found to two process working ( i don't remember what they were called) so i ended those process and the dvd stoped playing but now neither the cd drive or dvd work, and i can't even find them in My computer. so i went to add hardware, added the drives and it said that it added the software or the drivers for them but the drived themselves are unpluged. i never unpluged them. what can i do???