I use Power DVD 4.0 and have no problems. I had problems with version 3.0, but there is a patch that fixes it, or you will need 4.0 which is recommended for XP.
What is it exactly that is happening? an error? or they just won't play or what?
First thing that comes to my mind is codecs - have you tried reinstalling your video codecs? I would suggest reinstalling the newest Nimo Codec Pack and giving it another try. Works great for me.
I've got both powerdvd 4.0 and windvd 4.0.
The same problem happens with both. Its not really a big deal, only avi files don't work, I can play those with media player, but if there is a solution let me know.
You can play .avi files with PowerDVD ??? Never heard that. Never tried that. Hmm just tried it. It works for me in Win2k. I'll try it on my daughters XP machine....The only .avi on her system is clock.avi and it worked OK too. Well you learn something every day. To tell you the truth AVIs look better in Media Player anyway. Sorry I have no solutions for you.