I tried the steps mentioned earlier but in my laptop after opening proxy settings under connection tab my LAN SETTING button is disabled . I cant click it.So i cant proceed forward. pls help. I even tried ding the same in safe mode but problem still exists.
You may want to start at the beginning, why are you trying to change your proxy server. if you have some settings disabled it may be due to a policy set on your computer, which is often done by a corporate IT department. Is this your personal system? Why are you trying to change the proxy server manually?