ok try this
Please f12 or under internet option look for Developer's tool
One the window is open look for Browser mode and change the mode to IE8 or IE9 refresh IE or open up a new one.
In a perfect world it works. or try below
http://stackoverflow.com/questions/21568502/ie-enable-disable-proxy-settings-via-registry
Disable its proxy which is built in and check if it still fails let us know