Originally Posted by
Cornish Jack
Thanks again to all and a final update.
Router remains on WEP; Dell continues to operate wirelessly, upstairs and downstairs; Advent resolutely refuses to make the wifi connection but has excellent signal strength; the Nexus has instant connectivity, again upstairs and downstairs; I am a contented bunny

Jack,
Just one final question - does the router's configuration actually mention WPA2 at all?
I ask because it may well be that the router is from the vintage when WPA2 didn't exist, and that same time was considerably more difficult from a wifi setup point of view as I experienced a lot more issues of the same ilk.
Can you ascertain the exact model number of the router? as it may be that a firmware update to that router would get it working with WPA2 which would then support the later devices.
Cheers,
Mike.