To reset the Hosts file back to the default in Windows 8/7/Vista/XP, follow these steps, as appropriate for the operating system that you are running. Navigate to c:\Windows\System32\drivers\etc or press Windows key + R and type in
You don't have permission to save in this location
If you encounter the error You don’t have permission to save in this location when you are trying to save the Hosts file, that means the account that you logged in you doesn’t have administrator permission to save a file or the hosts file is protected by other programs. You may try the following suggestions one by one to check the issue. 