ok try this: click start / right click my computer and highlight manage, and hit enter / once there, click on devise manager , where it say's dvd/cd rom drives..
open the tree to it, and it will display your cr rom/dvd drives / now, right click the drive your having trouble with and un-install it. / that's it / now just reboot.
when your computer re-loads it will automatically detect the drive and install the driver's to it. once it does that, shut down and reboot again. now you should be all set to go.