Sometimes UAC level on your PC does not allow to launch it.
Could you please run the program as administrator? See how to do it for example here http://www.howtogeek.com/howto/windows-vista/always-start-an-application-in-administrator-mode-on-windows-vista/. If you use Windows Vista, you can try to run software in a compatibility mode. (Right click on the program shortcut, choose “Properties”, compatibility tab, vista mode).