Need Help with my Computer!!!

[Jeff The Ninja]

I have a problem, it deals with games but I think it is a hardware issue so i posted it here. My computer has a 550 mhz processor, 98 Mb Ram and a Nvidia GeForce2 MX/MX400. The problem is that whenever I run such as the Demo for Max Payne or Oddworld Abe's Oddysee, My PC speakers (the things that beep when you turn on the computer) start beeping in a pattern of four beeps, each with a different tone. I have no idea why my computer does this and me and my great computer inexpertize leaves me stupified beyond mental strain. Help Me Please.