Vista - Wireless networking - "Identifying ...(Public Network).."

Hi,

I'm having a strange wireless networking problem. I defined a private
network in Vista, complete with wireless network connection & key.

When I reboot my laptop, it does not auto re-connect to this (only
network I have defined), instead it tries to create a new public
network (message "Identifying ...(Public Network).." appear in Network
and Sharing Centre), with access type of Local Only - i.e. no internet
access - but it does pick up the wireless sid name / key etc.

At this point, the machine has a local ip address 169.254 ..., it has
not picked up one from the router (but has picked up the DNS server
addresses).

The only way I can resolve this is to click on the red cross that
appears in the network and sharing center window on the link to the
world / internet image, where upon I get various options, 1 of which
is renew IP address for the wireless adaptor. Do this and then it
connects fine to my pre-defined private network.

My network works fine on XP machines.

Any help greatly appreciated!

Thanks,
Josh