the mouse settings might have gotten changed.. there is a setting for the cursor to go invisible when or while you are typing.
usually you can press ctrl key to have it show the cursor

I don't like that setting - i like to see where it is all the time

If you want to check your mouse settings go to control panel, mouse and then on the property tab you'll see those setting options.

While in the control panel you can check you Display settings -
go to the settings tab and see what the screen resolution is - maybe that got changes somehow and the screen is too big??

you can test different settings but remember the original number/size so you can go back to it if you try many settings.

You can test it and it will show the new resolution then ask if you want to keep it or not, so if you say no it will go back to original.
If you do it that way you won't get confused as to which is the starting one.