Navigate to Network & Internet > Proxy. In the Proxy section, you will find an option labeled Automatically detect settings; toggle the switch to enable this option.

By default, browsers such as Internet Explorer automatically detect proxy settings. However, you might need to manually set a proxy with information supplied by your network administrator.

Ok, I'm guessing that Windows stores the Internet Properties Proxy Settings in the registry, I saw some files under:Windows Registry Editor Version 5.00[HKEY_CURRENT_USER\\Software\\Microsoft ...