Ive been trying to record videos with fraps but i've been lagging and gettin low fps. i've also tried using game booster as well as changing the recording settings and still get the same results. here are the specs of my rig:

Win 7 x64
ASUS M4A79XTDEVO Motherboard
AMD Phenom || X4 955@ 3.2GHz
4GB of GSKILL 1600MHz
EVGA GTX460 Superclocked Edition
Corsair 750w PSU

Maybe an upgrade to 8GB of ram, or new graphics card?