This is a repost of a post from an old blog, made on June 1, 2012, that used to be on:
I had some problems with Cisco VPN client 5.0.07 today, when I would start it, it would just go straight to taskbar, the window would stay minimized and wouldn’t open when I click on it. The only way to open it was to hover with the mouse pointer over the taskbar and then right-click the pop up window and click ‘Maximize’. I little time on Google and I found the solution to the problem.
The problem can be fixed by editing the vpnclient.ini file inside the “C:\Program Files\Cisco Systems\VPN Client” folder as is stated in one of the answers on this page.