I've had no probs installing nVidia drivers for my FX5200.
Although Im running FC 3, I followed the guide here:
The basics of installing the nvidia drivers should be the same, ...
i#> chmod +x nvidia.drivers
from the console (make sure X is NOT running), run the driver install program
#>./nvidia.driver.xxx.run (whatever the file is called)
After its finished, just edit your xorg.conf file in /etc/X11/
edit /etc/inittab and make default runlevel '5'
reboot ... and hopefully you should get a logo for nVidia before the login manager...
(PS Nvidia has a FAQ/help to aid in editing the xorg.conf file)
(Im sure you just comment out "dri" and "glcore", then change the driver from "nv" to "nvidia" all without quotes)
And Im well chuffed with the graphics and speed of my nvidia card, for £30 it kicks the ass of the radeon in my other machine!!