Windows Vista cannot connect wirelessly: no response from wireless

> Windows edition: Windows Vista Business
>
> System: Toshiba (laptop/notebook) Satellite Pro 32-bit
>
> Router : Netgear Rangemax ADSL Modem wireless router DG834PN
>
> Country: UK
>
> PROBLEM: Hello, I keep trying to connect to my wireless router with the
> above system with no success whatsoever. I have tried changing security
> options on the router and even removing it.
>
> I have even tried deleting all the wireless networks stored on the
> computer,
> but to no avail.
>
> I have ugraded the router with the latest software from netgear.
> My OS is fully updated.
>
> When I try to connect wirelessly, it fails. I diagnose the problem and I
> receive:
>
>
> "Wireless association failed because Windows did not receive any response
> from the wirelss router or access point"
>
> The notebook/laptop WILL connect to the internet if I plug in an ethernet
> cable, if that's useful.
>
> <HELP> Please, much needed.
>
> Tom Harper