Things You'll Need
Instructions
Visit your favorite search engine and search for a GameCube emulator for download on the Internet. Include the word "GameCube" in your search terms, as there are also emulators for other consoles.
Read reviews and make sure that the emulator you are considering is "freeware" before downloading, so that you don't download a dud or incur any costs.
Click on the "Download" icon for the emulator you like, then extract the file to a folder on your desktop for easy access.
Run your emulator and configure it according to your computer's settings.