I recently installed gears of War on my pc but the game will not play.A message appears saying"you cannot run the game with modified executable code. Please reinstall the game". I have reinstalled the game but the same message appears. I have looked at various web sites and some say that its a problem with Windows digital certificate.It appears the problem is due to a hard-coded date in the certificate that prevents the game being played from that date onwards. One solution is to set the system date back to before January 28 2009. How do I do this and will it cause problems to my other programs?.