Click the Start button (lower-left corner), and choose Settings.
Select Network & Internet, go to the bottom of the selections on the left side, and click Proxy.
In Automatic proxy setup, automatically detect settings or use setup script, by sliding to On or Off.
In Manual proxy setup, you can choose to use a proxy server.
Generally, it will be off and if you slide it to On, be sure to select Save. And if it was off by default before you turned it on, be sure to slide back to Off when you’ve finished using it.
Temporarily Turn off Proxy Settings in Internet Explorer 7, 8, 9, 10, or 11:
In Internet Explorer, click Tools (upper-right corner) > Internet options.
Click the Connections tab, and then click the LAN settings button.
Under Proxy server, clear the option “Use a proxy server for your LAN”
Click Apply and OK to save changes. Restart your computer.
for more details, visit : www.office.com/setup