I would like to know this as well. I have installed the newest version of the IPsec Client and get a driver failure when trying to connect. According to the release docs for this version, it should work.
Vista 64 bit is supported by the Cisco VPN Client.
The installation file you can download is the following
vpnclient-winx64-msi-5.0.07.0440-k9.exe
PREREQUISITE: Windows Vista users, ensure you have installed: Windows6.0-KB952876-x86.msu
Regards
Yamil
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