Facing severe problem in IE10 of automatically getting clicked on "use a proxy server" every 5 minutes in LAN Settings whereas it is not required to use any proxy server at all when directly connected through ISP broadband.

Using Window 8 Pro with IE 10 but facing tremendous problem in LAN settings. Every 5 minutes, it automatically gets clicked on "Use a Proxy Server for the LAN" and am unable to open any page unless the said setting is unclicked. The same applies while using Chrome or Firefox browsers.... none of the browsers behave properly and have to repeatedly unclick on proxy server settings (in IE or Chrome) and change settings on Firefox.

Any suggestions to get rid of this problem...??? Thanks