Unable to run ArchiCAD on Windows 7

I am constantly receiving an error message when starting my ArchiCAD 12 with Windows 7. It says “ArchiCAD cannot run on this computer.” The problem might be QuickTime is outdated. But I have the latest version installed already. Can anyone enlighten me and share your thoughts about my dilemma? Thank you.

Sorry, ArchiCAD cannot run on this computer.
Problem: QuickTime is either outdated,
not properly installed or missing.
