When working with your new version of Windows Vista, after you install your Cisco VPN Client software - which I did - you might get the error:
"Reason 403: Unable to Contact Service Gateway"
This is due to the fact that your VPN software will not work on Vista. There is presently a version out there (in beta) that works on Vista and you can find it here:
UPDATE - NO GOOD INSTALLS AT THE MOMENT. THERE ARE SOME IN THE COMMENTS.