My grandparents have got a brand new Windows 8 laptop, and they have created an account, and they have bound it with an email address. The problem is that they entered a Gmail address, but it has to be a Microsoft email and I have no idea how to change it.
I know about "PC Settings" and that I can switch the account to a local account there, but I can't access it because it is impossible to log in with that Gmail account. Once, the were logged on, but then they turned off their computer and now there is no way to log in and fix the problem.
How can I fix this?