My entire game uninstalled and all my worlds are gone

My entire game was apparently uninstalled after I closed the computer for the night, when I came back from school the next day my game is completely gone, and my maps are all gone. My language changed from Chinese into English and I was logged out, is there anyway I can recover my worlds? even a small portion would help immensely.

 

The worlds are my old save of a world I just imported in desperation.