My computer does not display anything after installing avast antivirus

Hello,i install avast free antivirus at my laptop and i did not reboot my computer,but when i turn off and on it display black screen
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More about computer display installing avast antivirus
  1. I wonder if with a free anti-virus you get tech support ? Why didn't you follow the directions when it said to reboot ? Not nuch you can do with a black screen , does it show anything during the boot up process ?
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