This article covers an easy way to activate the administrator account is from the command prompt with elevated privileges. Windows 10 includes a built-in Administrator account that, by default, is hidden and disabled for security reasons. Sometimes, you need to perform a bit of Windows management or troubleshooting or make changes to your account that requires administrator access.
Windows 10 administrator default password will not be required, alternatively you can enter password for local account and sign in.
To know if I have the built-in Administrator account in Windows 10:
1. Right-click the name (or icon, depending on the version Windows 10) of the current account, located at the top left part of the Start Menu, then click on Change account settings.
2. The Settings window will pop up and under the name of the account if you see the word "Administrator" then it is an Administrator account.
To reset the built-in Administrator account in Windows 10:
1. Boot from Windows 10 bootable CD/DVD or USB.
2. When the install now screen shows up click on Repair your computer > Advanced Options >Troubleshoot > Command Prompt.
3. Once you can boot into the command prompt, type "net user administrator /active:yes".
To enable hidden administrator:
1. Go to Security Settings > Local Policies > Security Options.
2. The policy Accounts: Administrator account status determines whether the local Administrator account is enabled or not.
3. Check the "Security Setting" to see if it is disabled or enabled.
4. Double-click on the policy and select "Enabled" to enable the account.