Thanks a lot. I will try that.

That sounds plausible, but somehow she managed to mess up the email adress and password during the process.

Any ideas on how we can sort it out?

Hi!
No it was done by clicking on one of those "upgrade to win 10 for free now"-pop up's from microsoft.

Hi!
I am trying to help my mother to set up her Win 10 installation.
During set up she entered a non microsoft email adress (***@telia.com) and then she entered her password. What she failed to do...