It is Tuesday so that must mean Microsoft is up to no good.. actually quite the opposite of course. They are releasing security patches and program updates on Tuesdays regularly and today was no different. As ZDNET reports, this latest patch is one for all computers and is classified as "critical" so in most cases you will not notice anything but because your computer will need to be restarted, this too will happen automatically (2 days from now on Windows 8 machines if you don't restart before that time).
Not sure if you are getting the updates? Just ask and I can point you in the right direction!