On some systems there is this problem with Cisco VPN service: cvpnd.exe must be excuted before you run the ipsecdialer.exe ( the GUI for the client ). But even if you start the service per hand in services.msc, it got killed in a few seconds after thus you can not run the client.
Update: thanks to
To work around this problem: Uninstall Cisco VPN in Windows Control Panel, then go to regedit and remove all the entries have Cisco term in them. Be careful, back up the registry with built-in export function of regedit first and do not delete somethings like “Franscisco”, ok ? Some entries can not be deleted, it’s normal, just F3 until you reach the end of the registry.