My computer won't connect to internet?

Yesterday morning my mother updated AVG, but now when I try to use my computer, the browsers won't load. Nothing that requires internet on my computer will work. I've restarted a few times but that doesn't help. First I thought it was just google chrome so I uninstalled it but the internet won't work on my other browsers either (IE and Comodo Dragon). Skype doesn't work. I know my internets fine because it's working on my cousins laptop, my iPad and my iPhone. This is really frustrating. Any possible solutions?

Then uninstall AVG.

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