Connecting to VPN (Mac OS X)
The Cisco VPNClient app is not officially supported in 10.8.  You may have some luck by using Java Preferences to specify the 32-bit JVM and either disabling the 64-bit or changing it to be secondary.  

You're better off replicating the settings from your Cisco configuration into a new native VPN (IPSec) connection.

Look for the encrypted Group password in your .pcf file, then head over here to get the decrypted value.  After that it should be fairly obvious.