After downloading the base 060929 zip file version of Orbiter, extracting all files to a C:\Program Files\Orbiter folder, and then starting up the application, the Launchpad window displays just fine but the Launch Orbiter button is dithered-out (the letters on the button are gray and not black and when clicking the button nothing happens). Has this ever happened to you? If so, how did you resolve the issue? Do you think I am trying to run the application on too old of a PC (even though I think I meet the posted minimum requirements)? The specs of my PC are: Intel Pentium III processor 664 MHz, 512 MB of RAM; Microsoft Windows XP Professional Version 2002 Service Pack 3; ATI Radeon 9550 / X1050 Series 256 MB Memory.