I don't know about fraps but Xfire should be fairly easy to set up. Make sure the "In-Game Renderer" is set to D3D9 or whatever version of DirectX you play the game in (probably dx9 since it's the fastest). You can find xfire's in-game renderer options under Tools>Options>Games tab. Once that is set, you should be able to start the game and press scroll lock + X to bring up the xfire in-game options. In the lower left you'll see a yellow pencil-looking icon that lets you display FPS or any other info you might find useful/interesting to have on your screen while in the game. To start recording, hit scroll lock + V. And if you want to be sure to capture those once-in-a-lifetime throw a C4 on a helicopter and kill everyone clips, you can turn on the "Flashback Capture" feature under Tools>Options>Video tab and select the box called "Enable Flashback Capture". When that's enabled, the recording will start 10 seconds before you even press Scroll lock+V to turn the video recorder on. However, this feature takes a ton of CPU power, so make sure you got that i7 overclocked.
If using Xfire to record video, I would recommend using full screen recording at 25 fps. Also make sure to enable audio recording as well if you want audio in your video. All Xfire source videos in .avi format are saved in C>Program Data>Xfire>Videos. Keep an eye on this directory because you can fill up even a 1TB hard drive in the blink of an eye when recording glorious high resolution footage.
