Why can't I log into my account after updating from 8.1 to 10?

[WPCentral Question]

It will not accept my password. I have reset it. It just keeps telling me it is wrong. I cannot access my account on my computer at all. My tablet has 8.1 and accepts my new password. I have no clue why my computer will not. I tried Tech Support, 7 different people, none helped. Any suggestions?