Your computer is corrupted by a virus. Lucky you, you have an antivirus. But it needs a lot of space to get the latest data base of viruses. Free some space and run the antivirus. Or hunt the virus by yourself. But beware. Don't delete system files or procceses. And try to save your graduation work if you don't want to write it again...

Controls: Mouse (Left Button to select and open, wheel to scroll); Arrows to select files; Enter to open file or folder; Backspace to return to previous folder; X or Delete to delete files and folders.