10 from a game played on FB
No surprise. Stay away from fb apps. They do no testing on them.
What I find interesting is that MS said Defender has been improved yet all these managed to get through.
Now do you believe that it's not good security software? MS is far too interested in not competing.
The way MSE works on W8/8.1 is that if you have other security software installed, it deactivates (but updates). If you have no other security software, it will activate. Not worth it though.
Best to use the online viral/malware scanners. There are several. And use HitManPro.Activate.