Microsoft released a patch yesterday that fixed 55 flaws in its products. Three of those flaws are listed as critical.
Brian Krebs explains what you need to update in celebration of Update Tuesday:
The bulk of the flaws (41) addressed in this update apply to Internet Explorer, the default browser on Windows. This patch should obviously be a priority for any organizations that rely on IE.
All that you have to do to make sure that your computer is fully up-to-date and secure is to check for updates. Don't know how?