Is there a free VPN software that uses network like ad hoc or computer to computer network?

Is there a free VPN software that doesn't require internet and has no virus or maliware that uses networks like ad hoc network which is also a computer to computer network. I am useing windows vista. Give specific detail on how to install and use the program. Has to be easy to install. Like a installer to it. Has to be easy to use like hamachi but useing a ad hoc network. Exept that doesn't require the internet or router.|||Why on this earth would you need a VPN (Vitual Private Network) for a LOCAL network which is PRIVATE to begin with? The concept of a VPN is to establish a LOCAL network on a remote machine. VPN's allow remote machines to be treated as local ones so adding a VPN to an Ad-Hoc that exists only locally is well, a waste of time and computer power! So just use the local network.. particularly when not one single sole who isn't connected can possibly use it!|||What magic thing do you expect to connect to that just gives you access to the internet without equipment or a line? To VPN though something, you have to have some sort of network access.