If your error was saying your registration key was invalid, it wouldn't be meaningless, not to mention if you had given us more information than "the annoying blue box has turned red for the past few days and told me something or other is invalid." perhaps we could have been able to identify the problem. Or you could have answered the questions we asked 4 days ago we could have helped more.
No matter now that you have resolved the problem, welcome to the forums.