Is there a way to play Halo 2 on a nvidia geforce4 4200 go gpu

Yeah. It's called swiftshader 2.0 (not 3.0 or your performance will be god awful). You ust put it in the folder where yo installed halo 2, run the game, and ignore the swiftshader watermark in the corner. Also, I recommend having your RAM maxed out because this method will put massive strain on the rest of your computer in order to compensate for your lack-luster gpu