If you don’t have an antivirus on your Windows 8 machine, then the free security essentials will be your default antivirus.

Steven Sinofsky talks about this on his blog at:

http://blogs.msdn.com/b/b8/archive/2011/09/15/protecting-you-from-malware.aspx

Sort of old news, but one that I think is important with the latest virus attacking Apple users, the “Flashback” virus.