have you tried uninstalling the dvd/rw and reinstalling it ?
right click MY COMPUTER>>PROPERTIES>>HARDWARE>>DEVICE MANAGER.
scroll down to DVD CD ROM DRIVES. click on the "+" sign to expand it, right click on your dvd r/w and select UNINSTALL.
then reboot your computer, it should find it and reinstall it.
-------------------- MY HELP IS FREE,BUT PLEASE CONSIDER GIVING A DONATION TO HELP IN MY FIGHT AGAINST SPYWARE. You don't stop laughing when you get old, you get old when you stop laughing!