I have used AVG and ZoneAlarm for years, but my PC recently started running really slowly (windows 7), with NO high usage detected by resource monitor. It's been a lot better since i deinstalled both. I'm temporarily using Windows firewall, and wanted to run an online scan without having to install anything. This was easy years ago. Now every "online scan" i look at wants to download something, usually an offline virus scanner, which sort of negates the "free online" blurb. Does anyone know of a real (and effective) free online scan service?