How can I make my HP Pavillion G-series computer run games faster?

I have a Hp Pavilion with a 4.2 score, AMD Turion II P560 Dual-Core 2.50GHz, 4gb ram 300 gb storage, and a AMD M880G with ATI Mobility Radeon HD 4250. I can play games like minecraft well on High performance and HD, 3D graphics but I want to play more games like Battlefield and Black Ops, MW2 MW3 -Beta. I use Game booster but it only seems to end my processes, how can i run my laptop to be faster for gaming without lag?
 
go into battery settings and change to high performance, also most the time with laptops specs dont handle like there advertised due to battery and "saving space" issues. On top of that just try doing the normal, clear off empty hdd space, and use a good defrag program like auslogics and optimize to read the data faster. Trust me gaming is hard enough with just BF2 on my dinosaur of a laptop stuck to windowed resolutions of 800x600
 
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