My MacBook Pro which I bought June 2014 now only boots to my desktop with no files (on the screen), no grey bar at the top of the screen, and no dock. Before this happened, I noticd that my computer was running very slowly, often giving me the spinning wheel of death everytime I clicked on something, but i brushed it off assuming it was because of the immense volume of documents, music, and photos I have. When I log into the guest account, everything is fine, although I had previously enabled it to only use Safari, but that has given me no trouble. Does anyone know how I can fix this before going to the Apple to store and waiting an hour to be serviced?