Vista Laptop (wont accept network key)

Just bought a Fujitsu Siemens Amilo Pro V3515 installed with Vista Home
Basic. The laptop will not connect by wireless to my Modem/Router. when it
says "Connect to internet" I click it. Then the available wireless networks
come up and I choose mine. It then asks for the Network Key which I type in.
It then comes back that this is the wrong Network Key.The key is totally 100%
right as it is being used on my old XP laptop which has never had any
problems. I tried connecting it to a nearby unsecure network and that worked
fine. Need help urgently. Thanks.

Cable & Wireless ADSLR10CW3 Wireless Modem/Router
WPA pre-shared key ENABLED
Data encryption - TKIP

FURTHER UPDATE - After spending 6 hours trying to get this working, I
progressed slightly. My Laptop will connect to my modem ONLY if I disable WPA
on the modem. This however leaves my network completely open to attacks etc.
If I turn WPA on again, it disconnects and back to square one. Please please
can somebody help. Im going crazy.

Darren Following excerpts from your post:"...It then comes back that this is
the wrong Network Key....", "...connecting it to a nearby unsecure network
and that worked ...." and "...Laptop will connect to my modem ONLY if I
disable WPA ...." jointly indicate (though the key works on the XP laptop)
the key you are entering does not match the key you enered at setup.
....
"Darren.H" <DarrenH@discussions.microsoft.com> wrote in message
news:4ACE24D5-C021-4F23-A582-D054829CFADA@microsoft.com...
> Just bought a Fujitsu Siemens Amilo Pro V3515 installed with Vista Home
> Basic. The laptop will not connect by wireless to my Modem/Router. when it
> says "Connect to internet" I click it. Then the available wireless
> networks
> come up and I choose mine. It then asks for the Network Key which I type
> in.
> It then comes back that this is the wrong Network Key.The key is totally
> 100%
> right as it is being used on my old XP laptop which has never had any
> problems. I tried connecting it to a nearby unsecure network and that
> worked
> fine. Need help urgently. Thanks.
>
> Cable & Wireless ADSLR10CW3 Wireless Modem/Router
> WPA pre-shared key ENABLED
> Data encryption - TKIP
>
> FURTHER UPDATE - After spending 6 hours trying to get this working, I
> progressed slightly. My Laptop will connect to my modem ONLY if I disable
> WPA
> on the modem. This however leaves my network completely open to attacks
> etc.
> If I turn WPA on again, it disconnects and back to square one. Please
> please
> can somebody help. Im going crazy.