How can i overclock my Processor

[Mano aamer]

Hi guys . I have got a a problem . My processor is amd athlon 64 X2 dual core processor 4600+ 2.40 GHz .
and I have got HIS radeon HD 5770 GDDR5 and i have got 2 GB of ddr2 ram and i have got windows XP professional SP3 .
when i play games like Mafia 2 , Fifa 12 , Fifa 13 , call of duty black ops , NFS Shift , N.A Noire , NFS Hot pursuit , NFS The run and many other games on 800*600 and all the details are on low they work on 10-15 Frame and when i play them on 1920*1080 all maxed out the work on 10-15 frame as well .
and when i watch videos on youtube for gameplays for my Graphics card in the videos these games work on 30-45 frames with fraps .
i noted some thing :- i started the task manager and then i started one of these games and then i played for 5 minutes and then i saw the usage of my rams and the usage of my CPU . the usage of the ram were 85 % but the usage of the processor were 100 % so i think this error comes from my processor .

how can i fix this problem . and i tried to overclock my processor but i couldn't do that .

how can i overclock my CPU ?

please help me guys .

I AM SO SORRY FOR MY BAD ENGLISH IT IS NOT MY MAIN LANGUAGE and I AM SORRY FOR THIS TALL TOPIC

 

[scorpinock2]

I am almost certain that it is the RAM, you only have 2GB, most games use more then that especially when you combine that with what the system is already using. 4GB is basically the standard for gaming now.

 

[Mano aamer]

Best answer selected by Mano Aamer.