I am experiencing pop ups. I also have glitchy behavior in gmail; often when I click on something there it does not respond and I have to reload the page to get anywhere. Malwarebytes shows nothing wrong, and I've tried to run Avast, but it won't run--I just get a message that says "running your full virus scan now" but it's stuck at 1% and the little circle thingie just keeps going around and around. I suspect I'm infected with some sort of malware that has disabled it. TIA for any help anyone can give.