Minecraft Launcher saying username is not logged in?

I used to be able to play minecraft up until right now. The launcher is saying I can only play demo even though my account is premium. I have added a picture. Please help. I do not want to spend another $30.

Added (1). I'm in Windows 8.1 By The Way

Added (2). I use my email to log on BTW

Download the Minecraft launcher your using the Old Demo launcher you need to download the launcher again. Then type your minecraft username and password make sure your not using your second account and thinking thats the premium.

Maybe redownload the launcher? If this problem still occurs, I suggest contacting their support.