Nvidia say:-
There are not drivers for the Riva 128 under Windows XP. We apologize for the inconvenience this may cause.
The Riva 128/128ZX was the first video card we made. Following the Riva 128, we decided to move to a unified driver architecture so that we could continue to provide driver updates through a single unified driver. Unfortunately, because this came after the release of the Riva 128, we were not able to include this into our unified driver architecture.
Microsoft say:-
The Microsoft Hardware Compatibility list @
www.microsoft.com/hcl and find that the device is listed as being compatible, however only for basic functionality as you have found.
Drivers are written and supplied by the hardware manufacturer concerned and not Microsoft.
In this instance you will need to contact the hardware manufacturer regarding the availability of Windows XP compliant drivers and their installation and use under Windows XP.
If they are unable to provide any suitable drivers then you would need to address their support policy to the company concerned.