This is very strange indeed, let me tell you what's happening:
First, I read the helpful posts and checked off the 2 things Ollie said (well, they were already checked), but just to make sure, I looked!
I closed all my programs, and placed my original Die Hard 3 disc into the computerE: drive (dvd player), automatically, power dvd opened up (like it always does), but this time it displayed the following error message:
"The audio disk you are trying to play is not supported by this application.
Continuin play may result in a lack of audio output."
Ok, so I removed my DieHard3, and tried it in 2 set top dvd players, and everything worked perfect (the original store bought copy)
So why now am I getting this message all of a sudden when I try on the computer?
One peice of info which may help...
Normally when I place a original dvd into my dvd drive, a page opens up displaying 3 folders (video, audio and jacket)
All of a sudden, the audio folder is not showing up.
I'll try another dvd and see what happens.