"YOU MAYBE VICTIM SOFTWARE COUNTERFEITER CLICK RESOLVE NOW TO GET HLP THIS PROB. & "ASK FOR GENUINE MICROSOF?

every time i open & shut down my pc.the windows xp logo appear on screen said, "you maybe a victim software counterfeiting click resolve now to get help this prob".Also down on my screen. the logo "ask for genuine Microsoft software"appear too, pls help how to remove it