All you need is Windows XP.
I don't think it is hard to configure network bridge in WinXP. Just select two network adapters, right-click and select Bridge Connections, nothing more.
Read this for more info:
http://www.wown.com/j_helmig/wxpbrdge.htm
/A new technology turns into completely outdated stuff before you have a time to read "Getting Started..." section.
/If there are some "system programmers" then others are unsystematic.