I personally don't use IE(Internet Explorer) much. I'm a big fan of Chrome. A lot of my clients use IE and have been complaining about it running slow and hanging up. I found that resetting it fixes it...for now anyway. Try this link and click on the "Fix It" button.

Is Internet Explorer slow? 5 things to try - Help & How-to- Microsoft Windows (http://windows.microsoft.com/en-US/windows/help/internet-explorer/slow-five-tips-to-boost-performance)

Make sure you're using IE-9 first...It seems to really boost the performance and solved the hang-up issues...for now anyway.
Oh..and make sure you are using IE when you do this..it won't work on Chrome, Firefox,...etc......