I dunno what happend but both my CD drives or not working. When I go into my device manager it shows both of them with a ! next to them. My asus CD-S520/A4 and Sony DVD RW DRU-820A both say "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)" I tride to put new drives for them but didnt work. Any help would be very nice.