Free SSL VPN customer
Try OpenVPN (http://openvpn.net/). It's cross-platform, entirely free, exceptionally safe and secure, and also as soon as configured it's exceptionally very easy to release. I can not validate whether it especially targets x64, yet the x86 construct need to work with the x64 style.
Modify : I need to state that OpenVPN won a "Bossie" in 2007 as the best Open Source VPN.
Additionally, OpenVPN 2.1 is Vista-ready on both x86 and also x64.