That is all set correctly but still no internet access.

Again give me screen from command ipconfig /all

Something wrong with wireless connection. DHCP Server is Enabled? Do you have mac filtering on router? Maybe make test without any securities?

DHCP server is enabled.

Sorry I don't understand the rest of your reply.

Wireless Security - you make disable for test and then you make connection.

I think I did that correctly but there is no change.

Install inSSIDer application on XP and give me screenshot from NETWORKS tab. Give me also information which is your SSID name.

I have been through all the setup, although I don't understand all of it.
Anyway the result of all that is that I still have a connection on my desktop windows 7 m/c and I now have a connection on my xp laptop
but I have lost the connection on my Vista desktop and I cannot connect my smart tv.
I really have no idea what to do now.
regards