Share your Wifi (also VPN) by "Virtual Router" Freeware (alternative to pay expensive licence to Connectivity: http://www.connectify.me/)
Homepage is: http://virtualrouter.codeplex.com/Unfortunately this freeware has a lot of issues: first you have to check your hardware for compatibility and mostlikely you have to install the software on a different drive than your Windows. So if you install Windows on C:\ then I suggest to install the "Virtual Router" on drive D:\. No idea why, but it works. Lots of issues are documented here: http://virtualrouter.codeplex.com/workitem/list/basic
Easy download is also provided by: http://www.chip.de/downloads/Virtual-Router_42810939.html