Opensource SSL VPN for laptop to home network?

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http://serverfault.com – Router/Firewall/Endpoint: Zywall USG20W Method: SSL VPN (IPSEC VPN only if not other choice) Laptop: Windows 7 x86 Auth Server: 2008 R2 AD I have biz class internet and a bank of static IP's at my home office. I run the Zywall behind a comcast gateway and can do simple 1to1 NAT. Im trying to figure out the best software for my laptop to connect home with. Man in the middle attack is possible and I deal with sensitive information. Based on all that I picked the Zywall so I can use SSL VPN and figured finding software would be easy. I have looking into OpenVPN it looks like I can only run thr (HowTos)