Shaders doesn't work for me. Why? Whenever i check the shaders box it just unchecks everytime i click OK

This unfortunately means that shaders wont work on your computer.

Oh? But I have Windows XP and a really good graphics card also much memory :l

What is your Grafic Card?

I think it is an ATI Radeon HD 5870 :/

Try upgrading your graphics card.
This might help you with that.

If that doesn't work, then Blam was right.
If you can run games like The Sims, Call of Duty or other graphics heavy games, then it means that your gfx card doesn't support OpenGL, which Toribash uses.

But I have it up to date and i play CoD 4 and MW2.... This is really wierd Dx

The above person already answered your question.

Your graphics card does not support OpenGL, which is what Toribash uses.
MW2 uses Direct2D, I would assume.

OK thats too bad. Well its a good game anyways