Under Device Manager / System Devices / VIA CPU to AGP Contrller
Does it list the driver file being used for VIA CPU to AGP Controller? You may need to fire up the registry and look at what driver is being used for the AGP Controller/GART. I'm not sure how to do that in W2K but the key in Win98SE is:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VIAGART
I seem to recall there are two different file names, depending upon whether you've used the Microsoft W2K Hotfix/Service Pack or the VIA driver update. VIA's is VIAAGP1.SYS, but there may be another that is installed by the Service Pack.
They are essentially the same driver, one is considered "Provided by Microsoft" and the other is a third-party driver, thus the different file names. The "Provided by Microsoft" file is actually supplied to Microsoft by VIA.