With Lag while using FRAPS

Okay i want to make a montage but when i use fraps i lag so bad that i dont get to ply normally and get sweet kills

any suggestions??
yes i have gamebooster and gamegain

XP SP3
up to date directx

ALSO i think they wont record my sound,,,,,,

please help thanks

closing all other programs helps, close some useless processes. the usual, it also helps to play with the fraps settings, like only updating the overlay once a second. stuff like that.

Graphics card? RAM? CPU?
if you list i might be able to tell you why...