When I play any kind of computer game my mouse doesn't show up. I can still click on things, I just have to spend forever searching the whole screen because I can't see it. This is a recent problem, it used to work fine. This is a problem with the mouse pad, wireless mouse, and corded mouse (I've tried them all!)
it can both be a software or hardware issue. if it were a software issue it might have some problem with usb drivers, try re-installing those, also try to check if you are not using any software that is interfering with mouse usb ports or such.
if it was a hardware issue, i would recommend you switch your mouse and see if it works, also try to create a new test user for your operating system and see if it solves the problem.
last solution will be try switching the usb ports.