I am having the exact same problem. I have a K62 400 on a VIA MVP3 Chipset. I even tried installing a dual port game card to resolve the On/Off issue with the game port. After that failed I installed the ol' stand by .. SoundBlaster 16. It works fine now even the game port.
I am curious if you are using the same VIA chipset, because I remember with 98 that I needed to install an IRQ router driver in order for the SB PCI128 to work at all. Maybe this is the problem.
Any info or input will be helpful.
Good Luck,
Omniman
