Manually edit the Options.ini file located in the user profiles folder if the game fails to detect modern monitor resolutions.
Execute setup.exe or the installer provided in the root directory. Command.and.Conquer.3.Tiberium.Wars.MULTi11.Cra...
Update your graphics drivers and ensure "Compatibility Mode" is set to Windows XP (Service Pack 3) or Windows 7. Manually edit the Options