

I also have Comodo firewall installed, with Defence+ turned ON. I still use MSE as my primary AV, as I find substantial slowing down of my old laptop with either of the other AVs. My personal suggestion is to use AVG or Avast if you need free protection, and have a fast enough PC/laptop with Core i3 or better. Apparently MS is on a self destructive path, as you can see from the quality of their AV product and the terms they are imposing on potential users of MS office today. Microsoft claims that the AV tests are not realistic, as the tests use sample viruses, which have infected only a very small fraction of the total number of PCs running Windows. It also requires manual updation, as the automatic update never works. MSE today lags behind almost every other AV in virus detection, as mentioned by some of the guys here.
