There might be some point in your life where you just want to tab out of the game to look out at another window, which is fine, who doesn't like to do multiple things at once? But if you do this act there will be a time when you try to go back to playing your beloved game only to find yourself stuck, locked out, greeted by a black window that you have no control over that prevents you from returning to your nostalgia cravings. At this point you might start alt-tabbing, clicking on the icon in the task bar, frantically doing everything you can and find no way to let yourself back in. Then you hear a voice whisper to you, it says "You were on the right track to getting back, all you have to do is hold shift while right clicking on the Frogger application in the taskbar and hit "maximize. It is this simple act that will lead you to reunition."
For those in fullscreen (by default) you will most like need to go to task manager (ctrl+alt+esc), find the frogger application, and do the maximize from there (try minimize if maximize doesn't work).
For those on W10 you will need to press the little arrow next to Frogger to access "Frogger - Paused" which is what you need.