To change the Administrator password in the Windows Server
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Log on to the computer using the Administrator account (via RDP).
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Click Start Menu or Search Icon, start typing "Computer Management" and open it.
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From the left menu, click Local Users and Groups.
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Double-click on the Users folder on the right side.
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Select your username and right right-click on the Set password.
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Click Proceed on the warning popup.
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Enter your password and click Ok button.
Example : D@vid$123
