According to an article that has been written by a yahoo editor, there is a security flaw within the IE browser. The browser allows a hacker to place code in a website which would infect your computer and allow the hacker to access any passwords you may type in. The hacker can do this with the security flaw within Internet Explorer.
The way this works is a program called a key logger will log any keys you type in when your using the Internet Explorer browser. Even more reason to switch to an alternative browser such as Chrome by google, Mozilla Fire Fox or Opera by Mac. My simple advice is to download a new browser.
Anyway dont take my word for it read the article here. Or google IE explorer security alert
More reason to switch to an alternative browser alert.