This question is having issues with Minecraft after a PC reset (I believe it roughly equates to a format). Depending on what the solution is, it's possible that this question might be better suited on perhaps SuperUser.
For the most part, once a question has been answered, it's pretty much given the "status-completed" badge and ignored for further reference (I see this a lot with off-topic or unclear questions).
So, depending in the cause of the issue, once the question has been answered correctly, should it be moved, or just left here?