accessing VPN PPTP ADSL via the Linksys BEFW11S4

Hello-

i live in Europe and currently connect to my ADSL service via a VPN PPTP
connection thru an ethernet cable to my ethernet modem to the network via
the phone line. pretty standard and it works like a charm.

I have purchased a Linksys wireless router, however I am unable to connect
to the internet via the router. I can connect from my laptop via the
wireless card to the router, but can't get further. I have tried everything
I know- hostnames, IP addresses, DNS, etc I understand - however, all the
talk about ports and port forwarding is beyond my knowledge. calls to
linksys have been a waste of time. their help desk seems to know less about
VPN PPTP than I do.

I have upgraded the firmware to 1.45.1 and my service provider (xs4all in
the netherlands) claims the linksys routers will work with their service.

any help or any direction towards areas I can find help will be greatly
appreciated!

Thanks,
Steve