Pop up window/repeated threat

I’m not very computer literate. I updated the avast program recently. I keep getting the warning pop up frequently, which is a problem for me because my son is autistic and it really bothers him. It seems there’s no way to change that. Many times however it’s the same threat over and over again. For example now I keep getting a warning about 7507.sindelclick every few seconds. Is there a way for me to change something to just shut that particular threat completely down?

Attach your basic logs. (MBAM, FRST and aswMBR…!!)
Instructions: https://forum.avast.com/index.php?topic=53253.0