HP laptop had RadSteroids installed. I removed that via Uninstall a Program. The pop-ups stayed. I have used AdwCleaner, Hitman Pro, Malwarebytes, Combofix, and Junkware removal tool. I have reset IE and Firefox. Pop-ups from (for example) - computerhelpdesk.co or Internet Donwload Manager2 continue to appear. I have tried the suggestions on this forum and they have really helped. I'm not sure what I'm missing. Any help is appreciated!