First of all, you need a game recording program
There's 
http://www.fraps.com/ (FRAPS) But the free version only does 30 seconds at a time, and is watermarked.
I use (someone mentioned it on here a while ago) 
http://taksi.sourceforge.net/ (TAKSI) but there isn't any sound at the moment.
There are others, which I'm sure you can search for.
When you have one of these programs. they'll usually have a key bind to start recording, and likewise to stop.
 
											
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berdi, did you just got owned again?