Two things i can think of
- same as above, uninstall and Re-install Power DVD or Win DVD
- My DVD PLayer lets you make 5 reigon changes then sets permenant to the last reigon. Check to see what the drive is locked to. I think this is a Windows Thing and Not a Hard-ware or driver thing. XP Locked my DVD drive to R1. I had to re-install Windows to solve this problem.
Look in the Hardware at the DVD player then at the Reigon TAB. I think no matter what make you have Windows gives 5 trys and 5 trys only. Would love to know a work-round for this, i use some 3rd party software to play R1's if i ever have to.