Check out FRAPS
Quote:
Realtime Video Capture Software - Have you ever wanted to record video while playing your favourite game? Come join the Machinima revolution! Throw away the VCR, forget about using a DV cam, game recording has never been this easy! Fraps can capture audio and video up to 2560x1600 on dual-core CPUs (1152x864 single-core) at up to 100 frames per second!
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http://www.fraps.com/
If you want to do a voice over I guess its a bit more complicated. Never did that but I would probably use FRAPS and then run that with Adobe Premiere to overlay the voice stuff. I guess there is "free" audio software that does that stuff, but if you want Movie/Sound, I don't know of a better app then Premiere.