In addition, your GeForce is sharing IRQ with your network card. That is NOT good. You need to resolve that right away. The way to do that is to move what slot your network card is in, which looks like the first PCI slot under your AGP card. You'll need to dig out the manual for your mainboard and figure out which PCI slots share IRQ's with other devices, then put your Ethernet card in a slot where it won't be sharing interrupts. By the look of the number of devices you have in there, you probably won't resolve all the conflicts/sharing, but you need to make certain that your video and sound are on their own IRQs.
Your USB is sharing with your modem as well, which is not as big a deal depending on how you are connecting to AH. Are you using broadband (network card) or using your modem to dial up AH?
Now as for nVidia driver versions, for that card on Win98 I would try the 7.78's, I have had good luck with those for TnT/GeForce level cards. If that doesn't work, give the 14.10's a shot. The later model drivers seem to only work well with GeForce 2 or later cards in my experience, so the problems you are having with the 2x.xx line of Detonators is not unexpected.
