How can i only allow in and out traffic from only port 80 and block other ports?

hi guys

i am facing a huge security issue and i want that in my webserver the trafic only use port 80 (in and out) and all the other ports block. i have bit idea that it can be done in firewall policy but i dont know how. kindly help

i my antivirus server has windows 2008 server r2 and the SEPM is 12.0.3.

kindly help guys