by
Jasim Ahmed , Technical and Engineering Lead , alkamilbooking.com
I had to do it once. I do not want to write the whole thing here to raise couple of votes. For your ease just go this link and you will get all what you need to install Apache Server with PostgresSQL.
http://www.postgresql.org/download/
by
Sohaib AlZyoud , Senior Software Engineer , Secured Services Systems (SSSIT)
get the appserv package from this site
http://www.appservnetwork.com/
after installing it, download postgresql from this site
http://www.postgresql.org/download/
install it, and you are ready to go