Since I upgraded to windows 10, I have been having problems logging in from a cold start . I am using microsoft account for login .  What I get is a message that I can't log in at this time and to try a different account or use my last successful login password. Sometimes I need to enter my login  password as many as 3 times for a successful login. This happens to me approx once every 4 cold starts . The problem occurs  after a few hours have elapsed after a total shut down. Never have this problems from a restart .  BTW I am using wifi to connect to the internet .  Any ideas what is happening and how to fix? Tks