it’s easy! try a program called “HostsMan”
HostsMan is a freeware application that lets you manage your Hosts file with ease. Features online update of hosts file; enable/disable usage of hosts file; open Hosts file with one click; merge two hosts files; built-in hosts editor; prevent other programs of writing to the hosts; scan hosts for errors, duplicates and possible hijacks; find how many host names; easily install newly downloaded hosts file; create encrypted backups of your hosts file; resolve host names; keep log of latest blocked sites; exclusion list and more.
You can find more about it here: http://www.abelhadigital.com/hostsman