Nero jumpy preview screen/burn



Hi , im new to burning and am having problems with Nero 7.

I burnt two DVDS but when I try and play them back on an independent DVD player or my PC the film seems to jump every second or so.

Ive tried reducing the drive/burn speed but to no avail.

I noticed when I previewed a different film for burning the jumping did not occur , I looked at the properties of each film and noticed films with a framerate of 23 fps have the jumping problem , while a film which had 25fps seemed to preview just fine.

Could this be the problem ?

And if so, is there a way of increasing the framerate of an .avi file using Nero or a separate program ?

Any help would be very much appreciated. Thanks