Microsoft has just released an emergency patch for Internet Explorer. It fixes a bug that lets you get hacked when you visit the wrong website. Even if you don't use IE as your main browser, you should really get this patch, because IE is integrated with Windows in a lot of ways you might not be aware of.
Microsoft issued an advisory saying Internet Explorer users who browse to malicious websites could have their entire system infected. And even if you don't use Internet Explorer, it's connected to other Microsoft programs like Office, so you need this patch no matter what. Microsoft didn't say if hackers were using this vulnerability already, but KrebsOnSecurity reports that some security experts have already seen the hacks in action.
You can install the patch using Windows Update, and read Microsoft's announcement here. For all the latest news on cybersecurity and new patches and upgrades, check back often to our Happening Now page.