You stuck in a third-party memory card so now your screwed. More than likely when you pull it out it's going to mess up the contacts on the inside.
That is why you should ONLY use Nintendo branded GC memory cards in the Wii. Third-party ones were never officially authorized for the GC and so they were never tested for the Wii.
Oh, and next time use the search feature on the right side of the screen, this question has been asked and answered a few times already.