Hello, I’m Virginia, a fellow user like yourself.
Sorry to hear you’re experiencing problems.
When was the last time you signed into the account online? If more than 1-2 years then it may have been closed due to inactivity - you should’ve received an email about it though.
If you have signed in regularly online then the account may have been hacked & the email changed to that of the hacker.
As we don’t have access to account details I would recommend following the instructions here:
https://support.microsoft.com/account-billing/y...
If none of the above work then you’ll require the account recovery form:
https://account.live.com/acsr
Please note if you have 2/multi factor authentication active on your account then you cannot use the form to recover the account.
If you’re successful in changing the details then you may find that the account is limited for 30 days, this is a security feature & cannot be circumvented.
If you’re no longer able to sign into the PC due to the account not existing then you can remove the drive, place it in a caddy & connect it to another PC to access personal files in order to save them, or you can use third party disk imaging software to create an image backup. The software can be installed on another PC, then create their boot media & use this to boot the problem PC & create the image.
I would recommend Macrium Reflect free:
Direct download link:
https://updates.macrium.com/reflect/v8/ReflectD...
Or download here:
https://www.majorgeeks.com/files/details/macriu...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products).
Please do not download any repair tool which may be offered by this site other than the ones I mention/recommend.
Thoroughly research any product which is mentioned here before you decide to download and install it.