need more ideas for no connection problems

[fasteddie911]

Hi,
i have used limewire for years and i recently got a new computer and my initial limewire setup on this new computer worked fine until i began messing with the option settings(upload/download stuff), which I doubt caused my no connection problem. However, i have read through various post/stickies and have done the following: reinstall limewire, deleted pref folder and setup port forwarding using port 6346. Here is my info:

1. OS version? windows 2000
2. What firewalls you have? none that i know of
3. How much ram? 5k+ MB
4. Hard Disk space available? 60+gb
5. Connection type? cable
6. Modem & router brand name & model numbers? linksys wrt54g
7. Where are you trying to connect from? apartment LAN
8. What version of LimeWire (LW) & Java do you have? 4.14.10, java 1.6.0_03
9. Who is your ISP (Internet Service Provider)? RCN
10. Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there? yes
11. Are you sharing the connection with other computers or p2p sharing programs? internet connection shared with other wireless computers
12. Is this a your 1st try at LW or is this a new problem with an experienced user. the latter
13. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? _yes click here to see Sample image
14. For those using a modem/router, how is your modem/router set up...are you port forwarding or is UPnP enabled? upnp is disabled
15. What security programs are you using (antivirus etc)? nod32 antivirus
16. What country are you living in? USA

This computer was built by a friend and I am not sure what programs and stuff he put in here, is there a way to search for firewalls? there are not obvious ones(norton, mcfee, etc), but maybe there is an "unknown" firewall somewhere? I am looking for any other suggestion as to what to look for and do. i appreciate any help, thanks!