What causes these warnings?

Several times over the past couple of days, Avast has shown me the warning:

Threat blocked
We’ve safely aborted connection on codeverge.com because it was infected with HTML:Script-inf [Susp].

Last time it happened, I was not using my browser. So, my question is simply this: What is this and from what program might the issue be sourcing?

Any guidance you can offer will be welcomed. Thanks.

Stick to one topic, three topics just causes duplication of effort for those trying to help.

I suggest this one - https://forum.avast.com/index.php?topic=301998.0 - as I posted how to post a screenshot of the avast alert.