If you are facing issue while running "call of duty modern warfare 3" that your mouse cursor doesn't work on the screen then there is quick fix for it, which worked for me. Hope it works for you too.. good luck!!
Solution:
Once you have run COD MW3 press ALT+Tab or you can switch to any other window while the game is running. Then again press Alt+Tab to switch back to the game. You will see that the issue is resolved.
Solution:
Once you have run COD MW3 press ALT+Tab or you can switch to any other window while the game is running. Then again press Alt+Tab to switch back to the game. You will see that the issue is resolved.