Thanks for all your help.

I have done the tests and they have passed OK.

I am running Windows XP Home SP2
Windows Firewall which has allowed LW and I have followed the tips and set up Gnutella
I use LW PRO version 4.10.9
I use BTBroadband ADSL with a Wireless Router - BTVoyager 2500 I use this with both my laptop which runs LW fine and my PC which won't connect.
I have 2 computers that connect to the network but I have turned my laptop off before connecting and this still does not work. The laptop always works.
I have not used LW before but set it up on my laptop then my PC after paying for pro version.

I was wondering if it had anything to do with the fact that my PC was bought from a shop with windows XP SP2 built in and updates with validated updates from Windows Update from microsoft and my laptop is installed with Windows XP Pro SP2 but can't validate Windows Updates from Microsoft. May this have anything to do with it?

Thank you all again & hope to have this problem solved soon.