I thnk he manes that the answer is already on this forum.. but anyway
The easist way is to buy (You can also d**nl**d it from P2* software.. does censoring that make it okay?

) FRAPS v2 and use that.
If you have 2 pcs, one with a TV out function on the graphics card, one with a TV card, you can use a cable to connect the TV-out to the TV card, and record on the second PC with something like Adobe Preimer or any other TV card realted software.. I recoomned S-Video cable, as most recent gfx card have this for output, and almost all TV cards have this on the in thing..
That way there is NO perfromance drop, which is very good.. FRAPs is good, but halfs FPS on this computer (While using it to a second harddrive), on the same harddrive it's lower.. This PC is 2.8GHz, 512mb ram, SATA 120GB harddrive (The other is 80GB something or other), GeForce FX5600. I can record with FRAPs v2 with around 15 to 20 FPS (Runs over 15 of that Battlefields misison that comes with OFP Goty, and posisbly others..).
You can guess how horirble it is to use on slower computers.. Games are not playable on 2 to 3 FPS..

if you need anymore help.. ermm.. Hm, post with more info, any problems etc
- Ben