lw unable to initialize and start?

i successfully dled limewire onto my computer and used it for a week or so..it worked perfect. Then i uninstalled it and re-installed it a few days later. This time it doesnt work, whenever i try to open lw it says "limewire is unable to initialize and start. this is usually due to a firewall program blocking lw's access to the internet or loopback connections on the local machine. please allow limewire to access the internet and restart limewire." I am at all times connected to the internet. If anyone could offer any help it would be much appreciated.