pretty sure you need some more memory
6 GB of ram isnt enough?
http://i.imgur.com/0bJ0dXI.png6 GB of ram isnt enough?
Fixed memory issue when quality is set really high - if set at or over 8000, the shadows are set to 5000, then incrementally by 500 until the desired value - this takes longer, but avoids the memory issue.
What are your GPU stats? ArmyGuy is asking for the memory of your graphics card, not your CPU.
I think that should fix it. Redownload
Take a screenshot of your settings and post it here. If you don't have some things filled in, it turns your shaders off. (Specifically the "level" and if the quality is set to 0).
"Level" has to be the name of the shader. renderCsm is the default shader, so put that in the level box. Not 0.
imgur is being really pissy and won't work at all so here's an image of it
that ultramax quality though holy ballsi didnt realize that was possible without murdering your computer, even for good comps