From what people I&#x27;ve talked to have told me - they don&#x27;t trust Microsoft to secure the OS.<p>Plus, e.g. Comodo gives you a firewall. While I know that Windows has a perfectly good firewall, it doesn&#x27;t come with a systray icon with a button labeled &quot;protection from active network probes: active&quot; or whatever.<p>Personally, I just have a router between me and the big bad internet and use Security Essentials plus Common Sense 2012.