If, when you login, you see the Nvidia splash screen, then you are INDEED running the nvidia video driver. Whether 3d acceleration will work could be more complicated, but if the driver is running, then you are most likely ready to go. The best way to be sure is to install a game and see if you get 0.005 fps or something more reasonable :-D
 Running 'glxinfo' will tell you if openGL acceleration is possible in hardware for the system as it is currently running, you should see the line:
direct rendering: Yes
If you've got the driver running, which it appears to be :-D then Hardware acceleration will be taking place, its not necessary to go click any check boxes. It is possible to adjust many things with driver options in your config file /etc/X11/XF86Config however. The nvidia FAQ has these options given for you.
Last edited by LordMorgul; 01-15-03 at 05:40 AM.