Help with Win 2003 VPN config.

I have a pptp vpn setup on a win 2003 server and I can connect fine. What I want to know is when I connect to the vpn it makes my public ip the same as the server’s public ip. The problem this makes is if I am remotely connected to a computer and then enable the vpn I lose the remote connection until i manually disconnect the vpn from the machine. Is there a way around this? Thanks