Here, i feel like wanna OC my system.. Because when i play crysis or assassin's creed, will felt laggy and sometimes even hang for few seconds when there're high graphic effect..

Below are my system's specs:
PSU - SilverStone ST400 400W Real Power
Mobo - Abit kn8 ultra
Proc - AMD64 3000+ venice core 1.8MHz
GC - Msi 9600GSO-OC
Ram - Corsair Value Ram DDR400 PC3200 (2x1GB)

Some CPU-Z and GPU-Z attached as below:

Details of my CPU


Details of my Mobo


Details of my Ram


Details of my GC


Please teach me how to OC all those things at stable status, ur help is much much appreciated!!