That error message is due to mentioned driver that is installed in your computer which are older. The VXD in question is likely FXMEMMAP.VXD file that comes with that driver, try updating the drivers to latest one that you card supports to see if it that solves the problem.

Forgot one thing to say, the Voodoo Rush is slow to get smooth experience on Quake III based engines, even with a fast CPU. I don't have this card, but I do have a Voodoo Graphics card which is also slow for this kind of stuff.

Voodoo Rush is slow even for vanilla Quake II.

Vintage id Tech3 games (Quake 3, Return to Castle Wolfenstein, Elite Force, etc.) are best played with vintage (or newer) Nvidia GPUs, as they have proprietary OpenGL extensions for the Nvidia hardware. Even the current Nvidia drivers on the latest GPUs still support the old OpenGL extensions used for Nvidia hardware and they look wonderful.

RetroGamer4Ever wrote on 2021-08-08, 23:14:

Vintage id Tech3 games (Quake 3, Return to Castle Wolfenstein, Elite Force, etc.) are best played with vintage (or newer) Nvidia GPUs, as they have proprietary OpenGL extensions for the Nvidia hardware.

idTech3 games don't use any nvidia extensions

The only nvidia specificness ends in nVidia's WRONG edge texture clamping behavior which breaks skyboxes for other non-nvidia/non-3dfx GPUs that actually implement edge clamps correctly.

If there's any one vendor-specific extension idtech3 games commonly use, it's WGL_3DFX_gamma_control and that's only for V1/V2 users.

Anyway the point is, Rush was a mess including in its day. Even OG Voodoo Graphics cards are a better choice due to performance and compatibility over the Rush. (and you can definitely run a few id tech3 games on an older, non-rush Voodoo)

I may get flamed for saying this, but if you actually intend to use a Voodoo based card (as seems to be the case, according to your post), it may be a good idea to offload that Voodoo Rush to someone who actually wants one more for its collectability than its usability (or lack thereof) and get a Voodoo 1, 2 or 3 instead . You might even end up making some money in the process .

Thanks for suggestions. Actually, I remember playing ID Tech3 games on it, and well it was a mess. I was barely able to play as it was slow as hell.