How do I get my FPS better?

Hey I have tried almost everything to get my FPS better on Cross Fire and nothing seems to work. I have installed Game booster and that helped the smallest bit, and then I searched some stuff up on the Internet and saw ATI Catalyst and I tried that but it costs money and after wards I go on to Cross Fire and my FPS is usually from 80 - 100 and it drops down to 10 - 20 and I lag horribly but I ask one of my clan members and he says to open Task Manager and go to Processes and "kill" off a couple of them. Well now I open that up and I'm to afraid on what to delete or not so how do I tackle this?

Any help would be much appreciated.
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