Wireless networking with ME

Hi Folks,
I am running a wireless network at home
PC1 WIN XP home
PC2 WIN Me.

With PC1 I have no problemos I can access the network and connect out to the
internet.
PC2 will not connect to the internet but it will connect to the network.
PC2 has had dial up connection in the past. It also connects into business
network without any problems.
There are no restrictions set on the router to deny access to the internet.
Internet access is tied to MAC address of both wireless cards. When I swap
cards I can still access the net therefore ruling out any hardware issue.

I have also manually configured PC2( ME machine) with default gateway etc...

Any help would be appreciated :-)
Ciaran