#3: FreeVPN by WSC
This solution not only supports Windows 7 and earlier but also supports Apple's iPhone and iPad. However, its free service is funded via advertisements.
Each time you connect to the VPN service, it changes your web browser's homepage to its customized search engine. It doesn't change back to your original homepage when you disconnect; you have to do it yourself.
Installing the FreeVPN client is a cinch. Once you open it, you'll find a small simple program, ready to connect to many different VPN servers among varying countries.
Paying users can input their login credentials to disable ads and enable the use of torrents while connected to the service. On the client you'll also find a place to input Proxy settings, if needed.