i have a decnt computer and graphics card, better than some people who play h2v, and i still only get 20 fps when i play.

what is wrong with my computer?

specs: 1gb ram, amd athlon 3800+ dual core 1.9ghz a piece, adding up to 3.8 ghz, ati radeon x1300 pro agp 256 mb 533mhz

i should be able to run it just fine, what should i do differently?

i play with all settings low.