Errors Loading Pages After Installing BitDefender

Seems like every time I switch from the antivirus that came on my computer to any free antivirus including Avast and BitDefender, I end up getting "page could not load" much more often than before I switched. Is there any way to fix this besides restoring my computer to a point before I switched antiviruses (which, so far, has been the only way I've found to solve the problem)?

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