It appears that the solution below is a coincidence. I am sorry.
Problem (Started 2013-08-31)
After the log in, I see the usual main menu:
Star
Opening Movie
.
.
Start button is not lighting up.
Observation
When I click the icon of the launcher in Windows, it no longer asks about program permissions.
Solution
Right-click on the icon of the client launcher > Run as Administrator
This will allow you to the next step (Start button will light up and can be pressed), but then... you may encounter other problems not related to Error 2002...