You can use several services on Microsoft Windows XP
TOTO Connection - All in one VPN Connection( Recommended )
You can use OpenVPN, sTunnel, TunnelPlus, PPTP and L2TP with this Connection
Kerio VPN on Microsoft Windows XP
Kerio VPN can be used for: Kerio VPN Server for connecting clients (desktops, notebooks, mobile devices etc...) Kerio VPN tunnel for connecting LANs.
Cisco VPN on Microsoft Windows XP
Cisco VPN is an SSL VPN Services. Its purpose is to be a secure, small, fast . Data transport over TCP (HTTPS) or UDP (DTLS or ESP).