Things You'll Need
Instructions
Download FCEUX, a free and open-source NES emulator for modern operating systems (see References below). Install it on your Vista computer.
Run FCEUX. Open the "Config" menu to set up the controllers, if you have any, and adjust the video size. Set the X and Y size multipliers to "2" in the "Video..." window to increase the size of the screen. If you don't have any controllers, you can use your computer's keyboard, using the "S," "D," "F," "Enter" and arrow keys to play.
Click on "File" and then "Open ROM..." to run a ROM file from your hard drive---an NES game itself in ZIP format.