you are setting your regions if illegally burning+copying and you have now done in your drive. Assuming you are not burning illegal copies, go to the My computer icon , right click, properties, hardware, device manager, uninstall the drives, restart and let Windows re-detect them. Also, use a dvd drive cleaning disk, could simply be dirty. Another problem which is quite common is the power supply going bad and they won't burn\read correctly or your dvd burning software has caused an error, try to uninstall it, reinstall along with the steps of uninstalling the drives\reinstalling drives. Do a system restore to a point it worked or you can shut the pc down, unhook the drives manually, turn on pc, shut down re-hook drives, restart.These steps have worked quite often to get DVD drives back to working order , HOWEVER, if all else fails, it may simply be as stated, a bad drive. Emachines, HP, DEll are good for this happening so as I said, try the steps above first.