Okay. Think about trying this. First, while you're still running your main computer, find network settings so you can just disable - that's only 'turn off' your internet connection, not uninstall. You would be just disabling the network card so that it doesn't start up at boot up, which I assume it does.
I can click a desktop icon of my network connection and select 'disable'. You can also try and find the icon on the right side of your taskbar that says 'internet connection',
right click it - select 'open network connections'. Then when settings opens, select 'change adapter options' > right click the icon that is your connected network, mine says
ethernet 3' and from the right click drop down menu, select 'disable'.
Then find and bring up your avast program console window, it should have a setting somewhere to set the program NOT to boot with windows. Find and select that.
Then power off the computer, and this time turn off the power after normal shut down. I have a power strip I turn off.
Then power up normally.
What this accomplishes is 1. You won't connect when you boot up and 2. avast should not be running.
You will know if the response is better. If no improvement and avast is indeed not running, it probably isn't that program.
Did you buy avast, or is it free? How old is it?
News 
Market Data 
Discover 
