What OS are you running. I'm having the same problem. I've got vista home premium. If you've got the same then look in System Tools, system information, components, problem devices.
Mine lists the dvd player and the isatap adapter, saying that windows could not load the drivers.
I've just loaded Norton 360, thats when the problem occurred.
I can't uninstall it because the drive wont read the uninstall disc. I've just emailed the computer manufacturer. I'll keep you posted.
Have you tried a system restore ?
steveD, April 2008