[Cat Daddy]

I'm confused here. My power dvd plays store bought dvd's and some dvd's that I've aquired in B&P's. Some of the B&P dvd's will not play. I get a message that there is no disc in drive D.
I can't figure out why all of the store bought discs play and some of the B&P's wont. Just started doing this today. Up until now it's been fine. My Windows media player 11 wont play any dvd now. It did before.
I'm thinking the VLC download/uninstall screwed something up. Anyone had this happen before?