Try AdwCleaner
https://toolslib.net/downloads/viewd.../1-adwcleaner/
Uninstall the bogus software, which you've done, then run AdwCleaner. Someone else around here has this infection, too. Maybe there's a link between you two getting infected and others here reporting their AV software blocking PPRuNe as a malicious site. It sounds like someone is serving malicious ads.