My mouse isn't working in a specific game

I bought a new mouse and it is working perfectly in all my programs except in Battlefield 1942. I tried putting using my old mouse again and that doesn’t even work in the game now. I have no idea what to do, does anyone have any ideas?

I’d suspect you’ve got a game setting set to “joystick” or “keyboard” rather than “mouse”.

Since I can’t change it in the game (because my mouse doesn’t work heh), how exactly do I change it back so that I have control with my mouse, instead of a joystick/whatever?

With something that basic wrong with the game i would try unistalling then reinstalling the game and see if that fixes your problem.