I am running Windows 7 (32-bit). The Doom game is run with GzDoom which is about the best front end for those who wish to play Doom today.
Back in it's day, the Alien Doom mod was, and in my opinion still one of the most intense, scary mods to ever been made. Today I installed the mod for Doom, and decided to see if the game still had it's same intensity, and it didn't disappoint me one bit. It took me back to when I first played this mod.
Thing is, you don't need great graphics to make a great game. Some of you may disagree though since all you see today is mostly great graphics, but very little game play value.