bsnes is a free program able to help run Game Boy, Famicom, Sufami, and Satellaview games. The program is portable (no need to install it) and easy to use. You can use bsnes to import as many image files of your games as you like.

When you enter your desired game you have the option to configure several parameters, such as gamma, brightness, volume, keys, server, etc.

The program runs without problems and lets even decide how much of your PC you’d like to devote, a nice option if you run other tasks at the same time.