My Windows 10 Computer Locked

Hi,

My old Windows 7 computer freezes some times so my friend recommend me upgrading to Windows 10.

I did it at night and was promoted to enter a password during startup.

I input the former password on Windows 7 but it didn't work this time.

Please suggest me a way to unlock the computer.!
Thanks!



I didn't find the right solution from the Internet.



References:
 able2know.org/topic/354112-1

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