I think my DVD RW is about to go belly-up.
I've had a few instances where it shows up only as a CD-ROM drive in My Computer.
Also, there have been some situations where it wanted to act in reverse. That is, when I put in a DVD or CD, it will pop out the tray. Even rebooting would result in the tray being pushed out instead of in. When that happened, I removed the drive from Device Manager, rebooted and let Windows redetect it. It's been working 'somewhat' OK since then.
BUT, now, when I play OBLIVION, the system keeps wanting to access the DVD...which results in the game halting while it does this.
I've updated the firmware on it but, I think it's just on its last legs.