PC can't connect to the Internet after avast boot scan

Just as the title says, after the avast boot up scan finished my pc shows the full signal bars in the desktop icon but can't connect to the Internet. It doesn't even try to connect. Also I get an error with Microsoft visual c++. I really don't know what to do so it would be great if someone helped me out here. I'm running Windows 8 64-bit.
 
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