The DVD is obviously defective and likely has a bad Windows file system.
If your drive cannot see it then Windows won't either.
No, that is not a protection.
Worked as in played, or worked as in ripped?
Two VERY different things.
-W
'Played'...
So I installed AnyDVD on that other machine (since there's a trial period) and it ripped just fine. So I guess it -is- a drive that's going bad.