Okay, tech time!
Here's how you reset the Wii:
1. A soft reset: Simply press and hold down the reset button for two seconds
2. A hard reset. I had to do a bit of research for this one. I found that the Wii has no hard reset facility that can be performed via buttons, but if you unplug it and leave it unplugged for 5 minutes it resets itself and everything should be restored to normal.
Good luck =)
Metroid Prime Trilogy
13/07/2009 / Final dungeon - Ocarina of Clank