You'll have to install the drivers for your graphics card, these can be found
run the .run file in a console, and when the drivers are installed
Edit your /etc/X11/xorg.conf file:
It is a good idea to take a copy of xorg.conf before changing anything.
change the line that says Driver "nv" or Driver "vesa"
to Driver "nvidia" .
remove the lines that say Load "dri" and Load "GLcore"
and make sure you have a line that says Load "glx"
Save the file and restart X, now you'll hopefully be able to run 3d-games.
If something goes wrong, just copy back your old xorg.conf.