[newbie] uninstalling Xfree 3.x

[John and Marcie Alexander]

I installed lm7.2 and finally got my nvidia drivers working.  When I ran X -version, I got 3.something as my current version, even though I checked the rpms installed and it seems x version 4.0 is installed. When I redirected X to the 4.0 server, all works fine now.  Does this mean I have both versions installed?  If so, how can I remove the one I am not using?