Dolphin

Dolphin is an emulator for two recent Nintendo video game consoles: the GameCube and the Wii. It allows PC gamers to enjoy games for these two consoles in full HD (1080p) with several enhancements: compatibility with all PC controllers, turbo speed, networked multiplayer, and even more!

System requirements: 

CPU: Intel i5-2500k or higher
GPU: ATI HD3650 or higher
RAM: 2 GB