Vista - Connecting Vista VPN drops wireless network connection

I have a VistaSP1 laptop used between two different store locations. The
stores are setup identically with a Linksys WRV210 wireless router. The
laptop has a wireless network connection setup for each office. The internal
addresses are different for each office. The laptop works as expected at one
of the stores. At the other store the laptop will work on the internal
network and get to the internet just fine until we try to connect to the
“home office� using Vista VPN. The wireless connection drops and of course
the VPN doesn’t work. The same VPN connection is used at the two stores.

Thanks in advance for any help.
--
Patrick
Systems Administrator