Seems that your browser's configuration is messed up by something else if you did not reconfigure it manually. This may be caused by a toolbar installed or a malware. What browser are you using? Are you using the same browser (Internet Explorer, Mozilla Firefox, Safari, etc) with your family? If you, check their browser's configuration against yours and see which one is different. Your browser should copy the settings of their functional browsers.
To check in Firefox:
1. Click Tool menu.
2. Click Options
3. Click the Advanced category (group)
4. Click the Network tab
5. Click the Settings button under the Connection group
6. Make sure "No proxy" is selected
In Internet Explorer:
1. Click Tools menu
2. Click Internet Options (Bottom)
3. Click Connection Tab
4. Click LAN Settings (bottom)
5. Make sure "Automatically detect settings" is checked
If these settings are already set and it is still not working, try to uninstall some "newly installed" browser toolbars or download and install Anti Malwarebytes to remove all malwares in your PC. You can download it free
HERE.
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