SP2?

my hosts file is blank
and when i try to copypaste the
#127.0.0.1 guard.nexon.net
line, and try to save they tell me i dont have permission(and ask me if i want to save in documents instead)
when im already an admin ==
do i just still save to documents, to copy over to the etc directory

create a new hosts file, swap in the data, and delete the old one.