My Avast! pro won't let me visit sites it deems unsafe. I get a popup warning me with no way to override. A good thing IMHO since it prevents me from opening the site anyway. It has saved me in this manner on several occasions thus far. It also scans incoming emails for malware. The browser addon WOT also warns me about potentially unsafe sites though it will allow the user to visit flagged sites, not recommended. In addition to all the other stuff I do to protect myself and my machine I also run all my internet facing apps in a sandbox using the excellent Sandboxie app. Doing so prevents anything nasty that gets by the other stuff from ever installing on my machine. Awareness, caution and resisting the urge to click every link on the web goes along way to preventing problems. Common sense seem to be underrated these days.