MICROSOFT ACCOUNT LOG-IN PROBLEMS

[JJ_J]

So, I've just built my new PC a few days ago, I tried logging in with my Microsoft account and it says "wrong password", I was pretty sure it was correct but fine I've changed it, everything worked.
A few days later my PC says Microsoft account error, please login again, I tried and again "wrong password", I've changed the password thinking ok maybe I'm so dumb that I can't remember it and saved it wrong, so I've changed my password again, logged in on the site and on the pc, everything was fine and now....wrong password again. I've asked to chat with someone at Microsoft but of course, they left me there waiting for hours. 

Does anyone know anything about this problem? Any proven solutions?
I looked online but found nothing working or nothing similar to my issue.

[Kilrah]

Malware?

[JJ_J]

Thought so, but then I've run an anti-malware and antivirus and nothing popped up, and, for more last time I've changed my password I did it form mi Mac and tried to log in just on the site form safari a few days later and still the password was "wrong". Seriously, it's super weird, even more, the fact that, it doesn't accept the password only in windows shared experiences.