The following steps contain everything you need to log you in as an administrator on Windows 10.
- Click Start and then type CMD, then press Enter.
- Simultaneously press the Ctrl + Shift + Enter keys.
- The UAC box to open elevated Command Prompt will appear, click Yes.
- Type in the following and press enter:
net user administrator /active:yes
You have now activated the administrator account. Log out of the user account and log in as the admin user and retry the action you were attempting before.