you will google but this is what I did.
the problem is, after authentication, the vpn cannot establish itself. in device manager, the cisco network interface has a warning.
1 - reg key modification:
2 - uninstall cisco vpn and reboot (this actually doesn't touch the reg key)
3- follow instructions here http://www.citrix.com/go/lp/dne.html run winfix and then the dnupdate
4 - reboot and install cisco vpn client
5 - run the vpn client, delete the device with the warning sign in device manager
you will see a valid device disabling and enabling itself when the vpn is establishing itself correctly.