You'll have to get a Gamecube Emulator, and you'll have to find a way to pull the game data from the disk or acquire it in ways that shall not be discussed here.
Be aware that a Gamecube emulator will require a fairly beefy CPU and graphics card to get acceptable performance, so it won't run well on some old laptop equipped with integrated graphics. If you don't have a powerful computer, I suggest you look harder for your Gamecube and/or Wii.