The brick wall means you have a firewall problem.

Try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included.)

If that doesn't work, then take a closer look at this link Connection problems? Check here first! (click on link). Make sure XP's firewall is properly configured to allow LW full access. Also, make sure UPnP is enabled on your Linksys router.

Who is your internet service provider (ISP)?