Thanks for the replies
I am indeed in "Pal Country" and was wondering if the 9% (?) speedup was to blame. Of the three examples I can think of off the top of my head the speed/pitch is either up a half or to nearly a whole semitone.
I have tried WinDVD but even with that effect it was either too slow or fast. The adjustment wasn't fine enough. Plus I'm really looking for something more permanent as I don't really watch films on my PC.
I have various bits of software I suspect could do the job but I confess the whole frame rate thing (if that is the route to go) is all a bit new to me. What values to alter/enter ect.
Again, any help is much appreciated. Thanks again