Vista Home Premium with Netgear WNR854T Wireless

Started up my new Dell Inspiron E1505 with a BGN adapter. All worked fine
with my old 54Mg Netgear router.

Installed the Netgear WNR854T BGN Router. All I did in the setup is assign
an SSID name. All laptops in the house connect fine. They are one XP Pro, two
XP Home and the new Vista Dell.

After it all works I go back and add WEP security (encryption), everything
functions except the New Vista Dell machine.

After and hour on the phone with Netgear they decide it is a Microsoft
problem.

Has anyone seen this?

As a summary, Vista is OK with not wireless security, but will not connect
past the router after security is active. Oh, when I look at the router page
I can see all the PC names that have attached including the Dell Vista. But
the Dell Vista can't make it past the router.

Cheers