@Flood and Flood's wife thanks, I have declined the adware and avast. but the notification is the problem. I hesitated to click “disable this notification” because I am afraid that windows will disable all similar notifications, not only utorrent’s.
Hey, this issue does not require us to open a case, just tell us how to disable the “The source of loading advertisements is blocked” notification?? It is still popping up every two seconds in Dec 2020.