felinoel,
Did you open 2 ports for Gnutella within your Win firewall? I'm only asking because your screenshots show TCP only.
You'll need UDP as well. You'll need to see Gnutella twice on the exceptions page.

The problem is likely to be your school. So many of them block or filter p2p. Are lots of other people at school able to connect to LW? Here's an example

http://www2.iwu.edu/IT/help/helpdesk/shaper.shtml

You could contact your school's computer admin & find out whether they're shaping bandwidth. That way, you find out whether the problem lies with your set up or with the college connection