There is a common issue with VPN when you click to open the VPN exectuable and it opens, but you do not see it anywhere on the screen. This is caused by the X and Y coordinates being corrupted.
Have no fear though, the fix is very easy and straight forward.
Browse to -
C:\Program Files (x86)\Cisco Systems\VPN Client
Change the X and Y numbers down to only the first 6.
For Example, if it looks like this…
take it down to this…
That’s it, now save the file, reopen VPN and the window should appear.