Dan,
Give this a try. Click on "Tools", then scroll to and click on "Internet Options"; when the Internet Options box pops up click the tab labelled "Advanced" and near the bottom of the page you will see the option to Reset Internet Explorer Settings to their Default Condition, click the button labelled "Reset". This will restore your settings but it may also change your homepage, so be prepared to change your homepage back to the one of your liking if it changes it.
LTM,
Don