I'm getting these alerts all the time!

My home computer shows these alerts multiple times when I’m connected to home wifi(it’s the only wifi I connect to, I’ve come from college after 3 months). I did not have these alerts when I was on a different wifi 3 months ago.

Winsecurity is malware.
Follow the instructions to get help removing it > https://forum.avast.com/index.php?topic=53253.0