Okay, Duke Nukem 3D Atomic Edition just closes after the dos type screen thing, any ideas?

Specs:
XFX HD5670 GDDR5 512MB
6GB DDR3 Ram
Windows 7 64bit
i3-2100 3.10ghz

When you install it, the game creates a preconfigured DOSBox shortcut to get it to work properly since the main exe isn't compatible with modern systems, but you can use eduke32 instead of DOSBox. Eduke32 adds some extra features, by the way. Try looking into the Hi-Res Polymer mod while you're there to get an idea of what I mean.