Well, sort of, but it's an annoying problem that I don't know how to fix. Specifically the "Keep Aspect Ratio" setting in the GOG executable isn't working, since I don't get the black bars on each side of the screen.

Also, choosing different resolutions in the Build setup program is buggy because some of the resolutions (like 320x200) don't work correctly.

However, in my other machine (a laptop with integrated Intel HD graphics) everything works just fine... I wonder what's happening? Maybe DOSBox works better on the laptop than the desktop?

I know, I could just use EDuke32 for Duke3D but the other Build games I bought here also have the same problem.

Specs:

Intel Core i7-2600 @ 3.4GHz
8GB RAM DDR3
ATI HD6970 2GB
Windows 7 Ultimate 64-bit

This is probably caused by your graphics card's GPU scaling setting ([url=http://pcgamingwiki.com/wiki/Glossary:Graphics_card#GPU_scaling]details here[/url]).