When I went to Windows 7 - 64 bit, I installed Symantec 2010 firewall and anti-virus. Shortly thereafter my motherboard needed changing out. I had to reinstall Windows 7 and Symantec 2010. That was a week ago. Yesterday (Monday) I noticed Microsoft Security Essentials was also running on my computer. I'm not sure how this happened, but do I need both? I turned off Microsoft Security Essentials and you would have thought I committed some unpardonable computer faux-pas. A menu came up warning me that I was leaving my computer unprotected. Yet, I have Norton's little Green and black icon on my screen telling me that my computer is "Secure." So, what gives?