the saga continues.. I turned my laptop on this morning and it would not connect the adsl router via wireless. I connected sucessfully with a cable.
So I found my other router and plugged it in and configured it.
So i now have Computer -> router -> adsl/router. I disabled the wireless on the adsl-router.
Wireless works on both computers now. And I have internet access on both computers again.
So I am not sure why and at this second, I don't care as I have a working network connection again.
Unfortunately, I had to set the network up without security so if I have a sneaky neighbour, they can use my connection.
I assume therfore that the NIC in the PC is dead. And that the wireless on the adsl router is playing up.
I'll check all that in a few days and let you know.
Thanks for your help
Gunter