Your Microsoft account needs to be repaired - strange mail address

I got the message earlier today that my Microsoft account needs to be repaired, so I took a look at it, and when I click on "Jetzt beheben" (I assume the english term would be "Repair now"), it asks me for a password. But for an email address I have never seen in my life (berinchik****@mail.ru). When I click on E-Mail & Accounts, it shows 3 mail addresses, all of which are legitimately mine, now the question is, where is that russian mail address coming from? How can I find what the source of that is? I did a complete virus scan, came up empty.

Edit: the popup was from my Windows Infocenter, and the account was when I clicked on the System Panel and on "Repair now". No email, no webbrowser.

Hackers maintain large repositories of email addresses, and your email address is apparently now stocked by some hacker group. This has nothing to do with your computer, so it doesn't indicate that your computer is infected. You should be from now on extremely wary of strange email messages asking you to sign on for all sorts of reasons, and never click on a link in an email without being 100% sure of the sender.

Some of the world's best hackers are Russians, so a .ru address should be extremely alarming for you. By going on that website, you may have signaled the hackers that you exist and are willing to click links.

I advise you to delete this email and ignore it. If you are worried about your Microsoft account, verify it on microsoft.com, by entering the address manually into the browser's address bar. It's good practice for all emails asking you to click on a link, to get there yourself using addresses that you know, rather than by clicking links.