I have a question how do I play modern warfare

i've had modern warfare for the last two years and all the updates made me not have my multiplayer for modern warfare anymore and I don't know how to reinstall multiplayer for modern warfare since I have the disc version and I don't know what to do because Customer service will not help me can someone online help me

Official word was by activision

Question. Can I play Call of Duty: Modern Warfare Remastered without buying Call of Duty: Infinite Warfare

Answer. "No, you must own Call of Duty: Infinite Warfare in order to get Call of Duty: Modern Warfare Remastered."

I recently downloaded Call of Duty Modern Warfare. When I go to start up and play screen freezes and shuts down my game. I hear that this is an issue that happening throughout the Xbox community. My question is as to how long do I have before this issue
is fixed. Whose issue is it to fix it Microsoft or the devs at infinity Ward? This is unacceptable this game has been launched for a whole week. also should I continue to try to play this game? I recently just received an update for Modern Warfare and it still
cut my game off.

I dont understand how you complain that they have done nothing to improve the graphics from morrowind when you are playing modern warfare 3, Activision have used the same graphics engine for Call of duty since Modern warfare 1!!

How do i uninstall. Games modern warfare 2