FS1 and FS2 works perfectly on my system: Windows XP and GF3 Ti200 (Previously Radeon 64 MB DDR ViVo and worked with it too).
I just downloaded the patch using this link:http://www.pxo.net/files/fs21x-12.exe
And it worked just fine.
When you start FS2, go first to Setup and select "Detect Available Cards", then select one of the choices from drop-down menu. You should have Glide displaying there, use it as you have Voodoo card that supports it.
If it does not work, then I suggest you to download these drivers:http://www.omegacorner.com/
Go to "3dfx" and then select "V3/4/5 WINDOWS 2k OMEGA DRIVERS 1.03b DRIVER [1.52MB]".
Or "V3/4/5 WINDOWS 2k OMEGA DRIVERS 1.03b KIT", this one includes more than just the drivers. I don't have Voodoo so I don't know better.
Remove your current drivers, reboot and install the new ones. As far as I know, those drivers are the best you can get because there will not be newer drivers from 3dfx...
By the way, if you use Omegadrive's, read the readme file!
(As one should always do if there's readme included...)