After the last updates available by the system in the application center, I think he formatted it on my computer. When I accessed it again, he sent this message that follows in the image. However, when I closed the message to save my files and programs, they had already been deleted. Now when I enter the system, the top bar for searching the apps, as well as the buttons for turning off, no longer appear. I also have difficulty opening applications that are installed by default, they close on their own.
I couldn't even send the question for him, because when I uploaded the photos to send here, I couldn't access the 'files' folder and I had to disconnect by pulling the plug):
What should I do? Help me please ):