Ah!
Thanks for that, NIS is used so much to mean norton, so thats what I thought. He is the first user to ask about Network Inspection System in mse lol
Not always good to use the abbreviations

As for MSE (Microsoft Security Essentials) MS most likely pushed out a new versions of it and disabled it. None of the other system updates affect it, MSE is a program by itself, so any changes to it and going to be done directly, so check and see if you had a new version of it installed.
Shane