I have gotten 2 Microsoft Virus scam alerts in the past few months. I downloaded a couple of programs to turn .mp4 to .mp3 or to capture audio from Youtube. I run Webroot, and MalwareBytes and neither showed any issues currently or in the past. I downloaded AdwCleaner and it could not complete a scan. I am on Windows 7 so I ran it as an Admin and it still would not scan. The error was that "a problem caused it to stop working". Firefox has started to operate very slowly, and other browsers sometimes do not want to even connect to the internet. I verified that I didn't see any unknown extensions or add ons for each browser, IE, FF and Chrome. Any assistance is greatly appreciated.