my macbook has just been infected i think. the desktop suddenly changed to some sort of electric eel/worm, and when i tried to load up activity monitor i noticed that the names of some of my applications had changed to random letters and the icons had gone. so i tried to click one but it didnt work. i dont have any antivirus software... apple gave me the impression that osx doesnt get viruses. does anyone have any idea what i can do. all my school work is on it and i dont have a recent backup. please anyone who has a solution or who has experienced this?