Instructions
Download Jnes (see Resources). This small application emulates the hardware of a Nintendo Entertainment System.
Insert your USB flash drive into one of the USB ports of your computer.
Make a directory on the USB drive called "NES" and save "Jnes.exe" to this directory.
Download ROM files for your emulator. ROM files are the software that simulate NES cartridges. See Resources for a directory of legally available ROM files.
Unzip your ROM files to the "NES" directory of your USB flash drive.
Launch "Jnes.EXE" from your flash drive.
Select "Open ROM" from Jnes' "File" menu.
Point Jnes to the ROM files saved in your USB drive's "NES" directory. Double-click the name of the NES game you wish to play and the game will launch.