This tutorial will explain howto install Nvidia 185.18.36 drivers in Ubuntu (64 bit) and enable visual effects.
First you need to download Nvidia drivers from here
1) Right-Click on the file: “Nvidia 185.18.36 Linux x64.run” and Click on “Properties”
2) Write down the text to the right of “Location:”
3) Close the “Properties” Window, and any other open Windows
4) Press “CTRL + ALT + F1″
5) Type: sudo bash
6) Press “Enter”
If prompted, type your password, and then press “Enter”
7) Type: sudo /etc/init.d/gdm stop
Press “Enter”
9) Type the text you wrote down from Step 2
10) Now immediately after what you typed in Step 8, Type: Nvidia 185.18.36 Linux x64.run
11) Press Enter
12) Follow the prompted instructions until the installation is complete
13) Once the installation has completed, press “CTRL + ALT + F1″
14) Restart your computer
Display Driver Installation Completed
Follow this procedure to Enabling Visual Effects
1) From the “Desktop Panel” Click on System
2) Click on “Preferences”
3) Click on “Appearance”
4) From the “Appearance Preferences” Window, Click on the “Visual Effects” Tab
5) Click on one of the “Visual Effect” options from the list
6) Click on the “Close”
Enabling Visual Effects Completed
More: continued here