You can change the admin user on a Windows 10 PC through the Control Panel. However, you'll need to be already logged into an admin account to do it.
To change your account name on a Windows 10 computer, you'll need to go through your User Accounts menu. Here's how to do it.
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What is User Account Control (UAC) in Windows, and can I turn it off?
Keeping your Windows system secure is vital for the operating system on your PC, and it takes some time and diligence.
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