Won't recognize DVD created on Pioneer deck

[Marty]

I have som DVD's that were created on a Pioneer DVD Recorder that are not
recognized on my computer. I have WinXP SP2. However, my old Win98SE PC
reads and plays them just fine. I recently reloaded WinXP and I just
uninstalled all my DVD players and only reinstalled PowerDVD since that is
what they play on in the Win98SE PC. It just doesn't make sense why it won't
play. It is a BenQ DVD+/-RW drive that I am using in my WinXP pc and I
bought it a little over a year ago. Anybody have any thoughts?

Thanks.
--
Marty