It seems that you might have installed some addons for IE and now you are in the situation. All you need to do it open Internet Options from Control Panel. Then in Advanced tab, click on Reset. Resetting Internet Explorer resets all settings to manufactures' default and in the process you will lose all saved passwords on Internet Explorer and you will have to re-enter them again upon use. Once done, fire-up IE and click on Tools menu > Internet Options and reset IE from Advanced tab once again from here as well. It means you will reset IE two times, first from Control Panel and then from IE window itself. Once done try to use IE and see the result.
However there are few addons available with Mozilla Firefox that resembles IE inside and opens all webpages that requires IE only. Download Coral IE Tab
Installed the addons and switch the view to IE to open all webpages that supports IE only.