I read about the failed tests and was surprised that Microsoft hasn't upgraded their MSE. According to a recent news article, Microsoft has already been hacked. Perhaps they are not concerned with Windows XP or 7 anymore, since they came out with Windows 8, which does not require MSE and has other security built into that program.
That is a shame, because I really liked MSE. I decided to uninstall it from my Windows XP computer. I wanted an AV that was compatible with Online Armor Free Firewall. AVG would not install with OA, and gave me a blue screen. Avast did install, but it would not start, even when I registered it. I ended up uninstalling OA and attempting to reinstall AVG and Avast separately, with the same result. I was able to install Panda Cloud and then did a fresh reinstall of OA. That combination worked fine, and I believe I have better protection than with the MSE in its current state. I am hoping that Microsoft will make improvements in that software to bring it up to the highest standards.
There are several good antivirus programs. Bitdefender is another good one, bit it slowed my Windows XP down, and I was also unable to shut that computer down. It could have also been the combination of BD and OA that was causing the problems.