Sony VAIO Fit laptop won't login with my Microsoft account or recognise password even though it's the right ones?

I have a VAIO Fit Model SVF13N12CG.

When I switch it on and try to log into my computer using the Microsoft account password it says it is not correct and try again. I can take up to 6 or 7 time re-entering the same password until it finally accepts it and logs in. Even when I type it very slowly it still won't accept it. It's like a luck of the draw when trying to log in??

I have changed my password, rest my password, reset the computer, everything everyone has suggested, it's just getting worse.

Please help?!?