What will happen if you don't update your computer?

Updates are typically security fixes of some type or another. Some times they are "good" fixes and other times they are "bad" fixes. I prefer not to be bothered by the mess they can create and NEVER update my operating system. I use ZoneAlarm firewall and I pay attention to what it is telling me. (I don't let programs run that shouldn't be running, that I don't want to run, etc.) I have never gotten a virus or had any security issues. Some folks allow automatic updates and while some may never have a problem with it, most people I know end up with some sort of mess they can't fix and have to reload their operating system or take some other drastic measure to fix their computer.