I'm having problems with Internet Explorer 11 I'm getting the message; 

> 
> The proxy server isn't responding and it won't connect to the
>  Internet.
> 
> 
> 

Firefox works fine but other programs need Internet Explorer to work, like with my Juno email program.

I'm using Windows 7, IE 11. I go through my WiFi, Router, & cable modem to get on the Internet. Using Avast Free Antivirus.

What I have tried:

* When I go into IE, Tools. Internet Options, Connections, LAN
Settings. It is all grayed out so I can't make any changes in that
area.
* Have I installed any programs lately to cause this? Well the answer
seems to be yes but I not sure what I did.
* When I go into Control Panel, Uninstall or change a program I don't
see and obvious programs that should not be there.
* I go into Internet Explorer manage add-ons and disable everything.
* I have checked my Firewall.

Not sure how to remove Internet Explorer to reinstall it.

What do I need to do to correct this problem?