Hi!
...the system is offering me to use an email address that I have no idea what the password...
Is your email address different from your main email? It should show your email address, unless it's a recovery email that you don't remember.
First, access your Microsoft account on another device (smartphone browser or another computer) to verify that it doesn't have any restrictions.
https://account.microsoft.com/
See this article if you are unable to log in to your account:
If your account is okay, try this:
Other solutions
- Restart the computer > Make sure it is connected to the internet correctly > Enter your new password. On the lock screen, click Login Options > Key icon to enter your Microsoft password.
- Another solution that may help is to disconnect the Internet or Wi-Fi cable from your PC > Restart your computer > Connect the Internet cable > Restart your computer > Enter the PIN or password again.
Point Recovery If the problem persists, try to restore your PC to a previous point.
- Hold down the SHIFT key and restart your computer in the Lock Screen.
- Hold SHIFT until you access the Recovery Screen
NOTE: If the computer cannot access Windows, before turning on the device, press the F8 key until it enters the Recovery Mode (do not stop pressing the key until you enter the option).
- Some manufacturers can change this key, such as SHIFT, ESC, F11, F12.
- Also try holding the key (do not stop holding the key until you enter the option).
- Try holding the WINDOWS key and the On/Off button, and when the computer starts, release them.
- In Recovery Mode, select Troubleshooting > System Restore
- Scroll through the Restore Window until you reach the available Restore Points > Choose the latest > Advance the options.