Since short, on my iMac OS 10.3.9 I couldn't fix a good connection with LW 4.10.9, I always get warning message about my firewall (but I didn't make any change there and it was working perfectly before)
I want uninstall LW completly and make a new install.
How to do it ?

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Your OSX firewall setting is fine. However the firewall detected may be coming from your modem/router. Many high speed ones have internal NAT firewalls. So to help there we'd need to know the brand & model numbers of that device.

To uninstall LW, simply drag the program to the trash. You can if you wish, also delete the LW preferences folder found here /Users/your_username/Library/Preferences/LimeWire

BTW if you have problems installing LW, then remove the installimewire package from the receipts folder & try again; Receipts folder sample image

I dont have, unfortunatly, a speed connection, if is that you mean. Am now (that is new indeed) connected via Built-in Ethernet. I changed provider due a lake of service and incredibly slow connection (Am in Indonesia)
This internal NAT Firewall you are talking about is something the new provider could have install with the antenna ?

Yes it is. I don't know much about radio connections. Unless you have satellite which may suffer the same issues. System details - help us to help you (click on link)

Ok. Thank You. Installer guy should come those days. i will ask him and get back with details infos if I cant fix myself...