I am running PowerDVD 4.0 under Windows Xp with LiteOn DVD 163. I got a problem where I can't play some of the DVD movie. It gave me the message "unknown file format" and I had enable region free (R1121 and RegionKiller) . I tried to play the same movie in the DVD player and it works. Someone told me that he had the same problem and it works in Windows 98 where he ran "msconfig" --> "advance" and disable something like "UDF".
Any solution to play movie in Windows XP so that I don't need to install multi-boot and play the movie in Windows 98?
AMD Athlon 1.2 Giz