You don't have to change browser - just try one (Firefox or Chrome would be good candidates in my view) even temporarily and see if the problem exists there. If not then the problem may be with your Internet Explorer or Adobe Flash installation. As ever diagnosing a problem so that you can fix it is a process of elimination.
Another possibility is going into your Control Panel Add/Remove Programs (or whatever it's called on your Windows version/configuration), uninstall Flash, and then download and reinstall it anew just in case that helps. If you are not 100% sure what you are doing then get help from somebody who does.