Guitar Hero: World Tour and Guitar Hero 3: Legends of Rock won't work on my Wii?

Whenever I try to play either Guitar Hero: World Tour or Guitar Hero 3: Legends of Rock it always shows up as "Error, please check your Wii manual" or something along those lines. This has been happening for about 2 months. For GHWT sometimes it lets me in the game but right before I can get to the menu it will go black (or its actually kinda reddish) and say the error. For GH3 it won't even let me in the game. GH3 started not working about 3 months ago, then GHWT stopped working. I thought it was the disk so I cleaned it (water and a towel :P) but it still didn't work! I really want to play, but it won't let me anymore :'(

I've had my Wii for about 2 years now and I've had GH3 for a year and a half, and GHWT for a year at the most and it never caused any problems before. I'm thinking of calling Nintendo, but I think they'll just tell me to buy the game again but it's not exactly cheap! Please help!
 
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