fourthousanddubsteps

I don't have the money for it. How about helping isntead of being that way? It's unplayable at this fps,

When I attempt to install mods on my vanilla client, it just says there's an error and it just refuses to start up. I need to get optifine because my FPS is like 6. My Pc has a bananna for a processor so it's hard to play at all. I've teried every possibility that i know. Help PLEASE