Acer Aspire 5310 DVD Drive?

I've got a puzzling one here...
I've had my aspire 5310 for around to years now and it's been great. I know that Acers don't have the best names in the computer industry...
But anyway.. all of a sudden, my DVD drive is not showing on "My Computer". Put a disk in, lights flash, it spins, but it doesn't exist on the "My Computer" window. And I can't seem to find it in my Device Manager either... Scan for new hardware and it doesn't find anything.
Any suggestions?

btw.. I'm running Vista Home Prem.