I recently ran into an issue with the install of Cisco VPN client hanging. So I needed to uninstall it but it wasn’t showing up in Program Files.
I had to use http://support.microsoft.com/kb/290301 to kill the install process.
Removed C:\Program Files(x86)\Cisco VPN …
Removed C:\Program Files\Common Files\Deterministic Networks
Installed latest DNE drivers:
Finally was able to install the Cisco VPN client 64-bit successfully!