I think you might be getting a bit confused as to what is actually doing the VPN work.
To have a VPN you need a client (normally the client at which you are sitting), and a server device (the point into which the connection is being made).
If you were to use the Netgear setup, I would expect the server would be the Netgear router, and client would be Netgear software installed on your local computer.
If instead you are trying to use Vista software as the client, what are you trying to connect to? The Netgear router? I suspect that might not work as the protocols for authenticating the connection may have different encryption and other weirdness.
Having said that the only VPN connections I've successfully used have been using the inbuilt Windows VPN connect to workplace stuff on my local PC, into a remove Windows Server box that is receiving the connection. Moreover I had to ensure the router's between the computers were fully compatible and didn't block the protocols. I've never been successful with VPN where a router in the loop was Netgear, even if the specs said the router was VPN passthrough compatible
