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Why did my computer just randomly start making this loud buzzing noise, and then freeze up?

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It wouldn't even let me restat or shut down, so I had to just press the power off button.

This happened right after I installed Avast, or when I was installing Avast.

Now, I don't think Avast installed properly, because the icon on my desktop is just a piece of paper as opposed to the Avast icon, and when I go to uninstall avast, so I can reinstall it again, it won't let me, and it says please wait until other programs are finished installing or something.

Can anyone help me out, and tell me what the problem is...and what I can do to fix it?

It's a brand new laptop, with Window 7 if that helps.