Are there any VPN independant programs other than using windows server

I was trying to do just a peer to peer network and it is not working, thinking maybe since i cannot find a working lltd protocol for windows xp, which i highly doubt is the issue, I was thinking is there an independant server station program that i can run in the background, to allow access to a specific resource without it gobbling alot of system resources, nothing to broadcast online but something that only users in my sub domain can have access to.