to start with you posted this in the wrong forum you should have posted in the general tech forum.
Now the motherboard drivers or pretty simple to install just run the executable it will prompt you from there. however there really shouldn't be much need to do that just now. I'd get the rest of the set-up running first.
for the video card drivers you'll need to visit
http://www.voodoofiles.com/3dfxhelp.asp sounds like maybe you ahve the wrong drivers installed. You might need to go to an older version or you might have an older version and need a new version
check the device manager and make sure there are no conflicts
edit: scratch that you might need to install the via chipset drivers before doing anything else. Its been awhile since I've used one of these via boards. However as I said you just run the exe dropping it to a folder that easy to find then just run the set-up. It should take care of everything fairly easily