Yes. However, you must make sure that the version of Halo 2 you are trying to play is the PC edition rather than the XBOX version. It should read "Halo 2 for Vista" or something similar. Now this does NOT mean it is only compatible with Vista. Halo 2 is compatible with Windows Vista and Windows 7, but not Windows XP.
No, if it is compatible with Windows 7 Professional it will be compatible with all versions of Windows 7.
Yes, it is compatible with Windows 7. I installed and have played it for hours and hours.
Yes because it works on my computer and I have Windows 7.
Sadly no, you can only play it on Xbox 360.
no
Yes.
yes, from windows XP to windows 7, but only windows!
Yes, Flight Simulator X is compatible with Windows 7.
Yes, Microsoft Office 2003 is compatible with Windows 7.
Yes. Halo 2 runs on everything from Windows Vista and newer (which would include Windows 7).
As of July 2013, Roller Coaster Tycoon 3 Platinum is compatible with Windows 8 if it is set to Windows 7 compatibility mode. This tricks the game into thinking it is running under Windows 7 and allows it to function normally.