Hi there!
It's actually pretty simple (at least in terms of describing what happened to my machine).
When I installed Power DVD 10, when going to play a video file from my extender, I get a blue screen that says:APPLICATION FAILURE A critical Windows Media Center process has failed. I did a system restore to just before installing PowerDVD and functionality has returned.
Simply installing this software renders my extenders incapable of playing video files (specifically XviD .avi's, but possibly others). Obviously I immediately uninstalled the software. I'd be happy to give you further information that doesn't involve reinstalling the software (I want to be able to us my machine!)
Thanks!
Ron