I got my Wii on launch day. Now after playing Wii Sports this morning, I went to the Wii menu, and it says my "system files are corrupted." They say that I have to either get it replaced or get a repair that may not guarantee that all old files will be saved. I opted for the quick replacement. They also would not give me the points that I used and had left over on the virtual console.
I searched and a lot of other people are having this problem. Oh yeah, I bought my Wii on launch day, and I'm just now having this problem.
I guess you should disregard the Friend code in my avatar.