Hi Leonard
WinGate VPN is required on both ends of the connection to implement the VPN. Unfortunately it will not work when one end is using XP's built in VPN
Once you have the WinGate VPN installed on both ends and configured one end to host, as Jono has pointed out you will need to export the VPN config file from the Host VPN and Import the file into the WinGate VPN machine at the other end that is going to join.
These instructions are included in the WinGate VPN helpfile and I would suggest you take a read of our VPN whitepaper on our website for a clearer understanding of WinGate VPN.
http://www.wingate.com/resources.php
Hope this helps
Regards
Erwin