A few days ago I came across a website and then avast! warned me that its web shield had detected a threat from that website (screenshot of avast! pop-up attached). Now the same "avast! Infection detected" message would pop up randomly three times in one instance when I'm on the Internet even though I didn't open that website at all. This happens every day at multiple moments. I've done a full scan of my laptop various times, but I've only come up with warnings (screenshot of full scan results attached).
What can I do to fix my situation? Thank you for any suggestions!
Infection: HTML:Script-inf