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I visited the NVIDIA website downloaded the NVIDIA drivers. I stopped my X server and terminated all OpenGL applications. I changed my run level to 3 so that it boot to VGA console and installed it. I successfully installed the driver, but after installing my resolution has changed to 640x480 and now I am stuck, and I can't access my sidebar.

I am a new user so I'll request a clear answer.

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Are you trying to install in laptop which has Nvidia optimus ? – Namshum Aug 19 '13 at 15:46
You can always scroll if the resolution is too low, go near a border and the screen will move in that direction, this way you can go to system settings and change your screen resolution, or install another driver. – Alvar Aug 20 '13 at 10:35

I am not very sure what you are asking, but it seems you are not able to use your computer because of a change in resolution. So my answer is based on this. Press Ctrl + Alt + T to open terminal or alt + F2 and type terminal

This will open the terminal. There type

xrandr -s 0

If this doesn't work try

xrandr -s 1280x1024

If you just mean to ask how to change the resolution, press the super key ( window key) and type 'display' and click on the icon named display. There you can change the resolution.

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Can you please add some more data about your problem... – AJha Aug 19 '13 at 15:32

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