But of course there are nice people who thought of us and you can use Shrew Soft VPN Client (http://www.shrew.net/). As the authors of the software stated,
The Shrew Soft VPN Client for Windows is a free IPsec Remote Access VPN Client for Windows 2000, XP, Vista and 7 operating systems ( x86 and amd64 versions ). It was originally developed to provide secure communications between mobile Windows hosts and open source VPN gateways that utilize standards compliant software such as ipsec-tools, OpenSWAN, FreeSWAN, StrongSWAN, isakmpd. It now offers many of the advanced features only found in expensive commercial software solutions and provides compatibility for VPN appliances produced by vendors such as Cisco, Juniper, Checkpoint, Fortinet, Netgear, Linksys, Zywall and many others.
It's general IPsec that uses it's own standard-based profiles but can also load PCF files. It's actually the missing part in any Windows-based system.
It works on x64 very good (tested on Win7 x64). Integrated already with an ASA using a PCF file and with a Cisco Small Business Router by defining settings by hand.
Thanks Shrew Soft for this :)