Komputer x leh nak log in!!!!! TOlonG!!!!!!!

mas e tu aku scan komputer aku...pastu tibe2 satu 'pop up' kuar dan suruh aku restart komputer aku...lpas tu aku x le nak log in smpai ari nie!!!! plsss tolong gua!!!!!!! im seeking your help!!! for those who knew how to solve this problem!!!pls post kat saye ye!!!!!!