Are you running Windows10/11? If you are see if you can stop the automatic updates as anything can be coming in with an update, lay dormant and then present a nasty problem. In Linux Mint I get to chose the updates and then verify them. You are the second person that has had tomfoolery on his computer today. I run two browsers on my laptop Firefox and Waterfox both are secure. 3 search engines Startpage, duck duck go and Swisscows.
