Need Help Setting up Ubuntu as VPN Server

I have an old cpu that I am running Ubuntu Server on.  I am currently using Samba to act as a file server for a central location for files.  Because I have not been able to invest in more storage space for the server I still have files on the 4 clients.  The clients are running the following: 2 laptops Vista, pcs XP.  I have a linksys wrvs4400N as my switch which also has a vpn server built in.  My problem is that I have already been thru linksys support to understand that quickvpn is not currently supported on vista platforms.  What I need to be able to do is use the laptops to access my network from home.  Because I cannot do this thru the built in vpn server on my linksys, I would like to know if there is a way to setup my Ubuntu server to also act as a vpn server?  Also, my understanding is that vista no longer works with IPSEC?  This was linksys' explaination for why it won't work with their quickvpn, because it uses IPSEC for the protocol.

Thanks for the Help!
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You Could take a look at OpenVPN works on Ubuntu, Vista and Win XP.
Run OpenVPN on your Ubuntu server and just install OpenVPN on windows..
Take the version with openvpn-gui for easy connect to your ubuntu machine.
Make sure to run the openvpn-gui with administrator privileges on vista else the server is not allowed to push new routes into the routing table of vista.

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