Download LogMeIn Hamachi:
LogMeIn Hamachi is a hosted VPN service that lets you securely extend LAN-like networks to distributed teams, mobile workers and your gamer friends alike.
Hamachi is a VPN client. It creates a Virtual Private Network over a public network like the Internet. When this client runs, it implements a virtual network adapter, and you’re given an additional IP address that identifies you on any virtual network you join. You then create a virtual network by name, assigning it a password. Now anyone running the Hamachi client can join your network by connecting to it by name, and supplying the password.