Extremely important Microsoft Windows update. It only takes a minute or two, so do it now.

It is so important that Microsoft didn't even want to wait until their normal second Tuesday of the month to when they normally distribute patches.

If you have your computer set to automatically install critical updates it is possible you will click on the above link and it will say there are no updates to install. This is good. But still click the link just to make sure you have it installed.