Or, a bot.
I'd disconnect and work from another computer if possible. As suggested, see if you can download MalwareBytes to your drive, run it, and update it. Or, download MalwareBytes from a safe computer onto a thumb drive, and try to load it to your box that way.
If all else fails, go to »Security Cleanup
and follow the instructions first.--
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots." ~ Albert Einstein