I just built a brand new system, here are the specs.

Mobo: Asus P4C800-E Deluxe
CPU: Pentium 4 3.2ghz
RAM: 512Mb Crucial PC3200 DDR
Video: Radeon 9000 Pro 128Mb
Powersupply: Enermax 550W
HDD: Maxtor 80gb Diamondmax 9 8mb Cache
Audio: using the onboard

I updated the bios to the new 1016 and I have the latest ATI drivers. My system locks up under Windows while playing Battlefield 1942 or Command and Conquer Generals Zero Hour. Under Linux I get insmod agpgart.o not found. I put the new drivers on and I'm using Slackware 9.1 I'm not sure why this happens. The temp on the cpu runs 37 Celsius and during like BF1942 and C&C it runs 48 Celsius. Anyone have any ideas?

You have described a variety of conditions, but I'm not sure I see your question. Are you asking:

how to perform a BIOS upgrade
how to cope with a lockup in Windows while playing a game
how to use the insmod command
how to improve your PC's cooling system
or something else entirely

Can you restate what you are trying to resolve, within a more focused framework? -- J.W.