Before, I didn't know how much Zdoom rules in the Doom source port contest. Now I know by how much it rules with basic software compatibility. What I am saying is that Zdoom visuals runs perfectly w/o the assistance of display adapters. When I tried GZdoom w/o the display adapters, I get epileptic colors that try to give me a seizure.
The reason why I go to default graphics setting is b/c I screwed around w/ my laptop w/ a different OS (some time ago) and its graphic software starts crashing last night when I try to use any graphic-extensive application (the web browser) for a set amount of time. I guess compatibility issues in graphics is still a force to reckon with . Ended up w/ removing the graphic driver utility (causes annoying popup) and scrolling over dunes of lag, but at least I don't have to worry about graphic issues for now.
The basic graphic settings are based on the operating system software. The choice of default screen resolutions is another story; at least I know that the 800x600 should be the standard screen resolution for most monitor screens.
The default graphics compatibility in Windows 2000 is disputed for me b/c my laptop + OS won't run zdoom w/o the graphics driver, but my desktop + OS can run zdoom (w/ the graphics driver [installation]). I assume that Windows 2000 need some graphics driver installation in order to run either GZdoom/Zdoom.