The school accommodation might have changed their policy regarding p2p use. As LOTR said in your other thread, most don't allow p2p use.
http://www.gnutellaforums.com/showthread.php?t=67607
Ask whoever's in charge of the complex's internet what the policy is. If they've stopped allowing p2p there's not much you can do. Can other people in the complex use LW? If they can...check out their setup.

Don't use 2 software firewalls, they'll only interfere with each other & won't work properly. Choose 1, configure it to allow LW & turn the other one off.

You could try changing ports, but there's no guarantee it'll help. In LW go tools > options > advanced > firewall config. Change LW's listening port to something in the range of 49152 - 65535.