Bitdefender Antivirus Free Edition offers baseline protection against viruses and all other types of malware. Using #1 ranked antivirus technology, it will detect and clean e-threats without causing slowdown or requiring configurations.
So for those of you who would like to have the best security package in the world but dont want to pay top dollar for it, BitDefender has a FREE AV for Windows.
Free Antivirus Software - Download Bitdefender Antivirus Free
I have personally just installed this myself to give it a test drive. I have used their products before and have been a big users of MSE as well. I have let Defender in Windows 8 handle all of my protection without a hitch. But seeing this free app has warranted some testing.
So far I have to say that I like what they have done. They have taken the best part of their protection and made it a worry free system. There is no interaction that must be taken. The app scans by itself without prompting. Not much more you can really ask for. After some use I will post back with more results.