microsoft security essentials

I just noticed- when I examine the programs list under control panel (sorted by install date)- that my microsoft security essentials was automatically re-installed on 10-september. I say automatically, since I didn't intend to, nor install this consciously...so wondering 2-questions:
1) how to check the version of microsoft security essentials running (I can't find this anywhere under the program screen; and
2) how to assure myself this wasn't some sort of rogue installation of a "dummy" copy that exposes my computer to future threats?

thank you
-pson

thank you...here is the application information from that about page:
Antimalware Client Version: 4.6.305.0
Engine Version: 1.1.10904.0
Antivirus definition: 1.183.2479.0
Antispyware definition: 1.183.2479.0
it does seem to be the most current, which appears dated 9-september...I'm based in asia time-zone so that might explain the auto-install date of 10-september in my programs list, but I wouldn't know for sure (usually such updates don't show-up as re-installations in this list, right?).
yes, I do use malwarebytes, which is active/running.

There was a MSE program update with the latest Patch Tuesday Updates.
Look in Windows Update History and you should see the update for this.

ok, I never noticed that section before, but can see it now.
however, microsoft security updates is not listed there...it only lists as though a new installation on the programs and features front page, which generated my concern as I did not intentionally/not manually [re-]install it at any time since I got the computer a couple years ago...