Internet Explorer...
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Security tab
6. Reset all security zones to Default
And/or
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Advanced
6. Restore Defaults button.
You may need to do the following as well
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. General tab
6. Remove cookies, temporary files and history
Kudos to Raptor.