|"WHAT DA HELL DO I DO!!!"|
You don't play the game, that's what you do. Your video card is NOT supported. You're gonna have to come up with some money & replace that antique. The Riva TNT2 is about 10 yrs old which is ancient in terms of computer hardware. What are the rest of your system specs?
Here's the system requirements for Halo. Notice the list of cards that are NOT supported: