They've discovered a major security bug in all versions of IE. Microsoft is working on a patch but it will only be available to users running an operating system that came after XP. (Vista, Win7, Win8). If you're still running XP, there won't be a bug fix.
So, basically, stop using IE no matter which operating system you're using. Use Firefox or Google Chrome which are both free. I prefer Firefox for the sites I access (Facebook) but Chrome works just as good. I just prefer the feel of Firefox.
For more info: http://www.pcworld.com/article/2148368/new-internet-explorer-zero-day-puts-web-at-risk-and-xp-isnt-getting-a-fix.html
eta: link with more info and for realizing that I was posting this from IE.
[This message edited by Thriving at 5:37 PM, April 28th (Monday)]