VPN – is it a possiblility for me?

We have 5 computers on a LAN running WinXP Pro, using a 2-way satellite service for our Internet connection. We have run an accounting program where all the data is stored on 1 of these 5 computers (the application is installed on each machine.)

We have a new office out of town & would like for it to be able to connect to our network or at least the 1 computer with the data stored on it. Office #2 has a DSL connection with a static IP address.

What is the best way to connect these offices?

Any suggestions would be greatly appreciated.