I haven't any protection

sa me gave je n’est plus de protection sur Avast il ne veut pas démarrer la protection en arrière plan ! >:(

avast repair

contolpanel > ad/remove programs > avast > Uninstall/change > repair option … wait a minute and reboot

Non-english zone ( Francais ) https://forum.avast.com/index.php?board=21.0

Could be caused by MBAM premium if the OP has that installed.