http://www.fraps.comrun this program in the background.
You'll then see a yellow number (framerates) on the upper left corner of the game.
Hit the record button (whatever you set this too) and it will record up to 30 seconds of whatever you see in the game or film viewer. If you want to record for longer than 30 seconds, you'll then need to pay for fraps at 30 dollars I think.
These files will be up to 300 megabytes in size. You can then put these clips into windows movie maker which is free from microsoft.com for windows xp users.
Or you can use Sony Vegas which costs a few hundred dollars.
I used:
Sony Vegas 5.0 (video editing software)
Creative Wave Studio (sound editing software)
Fraps (video capturing software)
Also note that you may need a fast computer. I have a 2.4Ghz 1gb ram and I CAN NOT run fraps and Aces High Film Viewer at the same time. If I do, I'll get 12 to 18 frames per second, which is very choppy. But I can run fraps and the game at the same time.
It took me half a week to learn how to use the software and 1.5 weeks to shoot and edit film.
Check out link in my signature for my first and only film of what is possible to do with all this software.