To install the drivers for your graphics card, open up a terminal and type:
sudo apt-get install nvidia-glx
You'll have to enter your password. Then restart X. You can do this by pressing Ctrl + Alt + Backspace. After you log back in, the drivers should be working...to test, do
glxgears
in terminal. You should see a window with some 3d gears. If it runs smoothly, you probably got it installed right, if they lag or run slowly, your graphics driver isn't set up properly.
Then, right click, go to Change Desktop Background, then click the Effects tab and try setting it to "Extra". This enables Compiz, a program that uses OpenGL based 3d hardware effects for your window manager. Moving windows will make them stretch like rubber, minimizing them will make them fly downwards, and you can even add more complex effects by installing the Compiz Fusion package in Synaptic (just open Synaptic and search for Compiz).
Beryl is an old window manager that did 3d effects. Compiz was also an old window manager that did 3d effects. The two merged, and formed Compiz Fusion, which is what Ubuntu uses for it's effects.