Recently we had a meeting with Microsoft staff at their facilities in Pozuelo in Madrid, one of the topics that came up was their antivirus and frankly I think that now Microsoft is taking this point seriously, they have improved their system a lot and if you can say that at this time you can trust.
Finally we must always remember that the best security is you, we must use technology with head.
A greeting

It helped me a lot more with that shortcut virus