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What is the make/model of the computer and what operating system is running on the computer is it xp, vista, Windows 7, 8, 10 or its a Mac computer?
do you remember what email is used as a user name to logon to Windows 10?
i can check online if thats the correct email or not with Microsoft
i need to know the email which is registered with with windows 10
If you do not remember the email you provided with Microsoft then its not possible for me to recover the Login.
Try to recall and let me know of else you will have to create a new email address and then your computer needs to be Formatted and reinstall the operating system again.