How To Max Out Your FPS

Any Pros out there know any really good ways of maxing out your graphics card! i try to overclock it but im too noob to do ir right or get it working idk, ive tryed closing every single background program, i try gamebooster but it seems and i hear from a few people at first its ok then it starts to use mem, idk i keep my pc clean , defrags every few days , disk cleans and all that, i play CF at lowest Graphics to get more out of my Graphics card , but i i get an avg of 20-40 in a full room , which when everybody is doing work! i get lag spikes ... im curious if theres any PC ''PRO'' out there can help me out or tell me if i got everything working good or w/e! or wat i can use or install or buy to put in to make more better!
i got a custom built PC here some specs
PC:
OS:xp-home edition
ECS motherboard/model-P4M800PRO-M
Processor:Intel(R) Pentium(R) D CPU 2.80GHz
memory:2048MB(2GB-Ram)
Vid card:ATI Saphire
Graphics card:ATI Radeon HD 3650
chip type:AGP (0x9596)
DAC type:internal DAC (400Mhz)
Total Memory:512.0MB

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