LOL... not installing pirated software, eh..?
Your /etc/hosts file is the file your Mac will look first to lookup a DNS name to hook the IP address to.
You can take a look at it by typing:
"more /etc/hosts"
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost
________________________________________
Might be a good idea to make a backup of the file first:
"sudo cp /etc/hosts /etc/hosts.old"
Good luck!