How to delete the Avast Popup Banner

I HAD Avast on my computer a year or so ago. I didn’t need it so I deleted it. Now, out of no where I’m getting (daily) this lovely warning telling me I have 18 viruses on my computer! I call BS on that.
There is no trace of Avast on my computer that I can find. I’m really tired of seeing the "hooded devil like face with orange eyes) any time I sign in on my computer. How can I get rid of it other than buying a new computer? Avasty 131.png (1536x1024) res.poc-app.store/resources

First, I’m an Avast user and not an Avast Team member.

A screenshot of what you are seeing might help, given that you are posting in the Avast Secure Browser for Windows sub-forum.

Since you say there is no trace of Avast on your computer, I would have to assume (dangerous) that is is from ASB ?