Thanks Taolar.
VirtualDub cannot open either of my videos. I take I need to install a DivX and XviD codec?
What video format do I need to convert them to? Which editor do you use for cutting movies together?
Any finally, the bit I'm most worried about is syncing audio to the new cut, what do I use for that? Actually the video will be based about the audio, I won't make any changes to the audio at all.