Go into Device Manager and delete your drive.
Now fully close down your computer.
Start up the computer again and it should find new hardware and reinstall the drivers for your drive.
See if that works.
It could of course, just be the drive has become faulty, or the laser needs cleaning. For the later, you can obtain a special disc that has a miniature brush on it. This spins in the drive and removes any dust on the laser. A can of compressed air will do much the same, but is more difficult to use accurately.