I was going to suggest the Rage XL driver, but from the looks of it its the same file as the Pro. I have a Rage 128 PCI adapter that is 8MB that I needed a driver to work with Windows 2000 Server and the XL driver worked for the Rage 128 GPU. The Rage 128 driver although should work with Windows 2000 Server errored out on me on install.
With Rage 128 driver version: 4.13.7192 and the Rage XL version: 4.13.2655 I believe I was using an older driver to get the Windows 2000 Server driver support to work.
Might be apples to oranges because your using 98 and I was using 2000, but I think if its truly only a driver issue, going with an older driver version might fix this like it did for me.
I would try using an older version maybe. You used 4.13.2655 and try a driver such as 4.12.7942 or 4.11.2579 and see if you get better results. Because its the same family of GPU and very close in release, it shouldnt impact the performance much. There might be a slight degradation in shader support for using an older driver, but it might fix the stability issue.