I have 3 profiles on my computer 1 mine,1 daughters and a back up (saved pics etc) but computer keeps coming up login failure then kicks me back off to log in screen. I put computer into safe mode and did the same on two profiles but let me into back up profile (didn't try to access before) thought might be a virus so did a scan nothing changed, deleted two failed profiles and created another only to find carried on doing the same?