The pop-up says everywhere, "To continue, please enter the administrator username and password."

The message means the current account does not have administrator rights or Windows is not getting the needed admin approval.

To fix it, try these steps:

1. When the pop‑up appears
   • If it shows a Yes / No User Account Control (UAC) dialog, choose Yes to allow the action.
2. Run the installer or app as administrator
   • Find the program or installer file (for example, an Office setup .exe).
   • Right‑click it and select Run as administrator.
   • When asked, enter an administrator username and password (if available) or click Yes on the UAC prompt.
3. Make sure User Account Control is turned on
   • Open Control Panel.
   • Go to Security and Maintenance and expand Security.
   • Confirm that User Account Control is set to On.
4. If there is no administrator account or password
   • Someone with administrator rights must sign in and perform the action or change the account type to administrator.
   • If no one knows an administrator password, the system may need repair or reset by an admin or support technician.

If this happens specifically when installing Office, follow the steps above (Run as administrator, accept UAC, and ensure UAC is on) and then retry the installation.

References:

• Administrative privileges required or error code 0-1005 or 0-2005 when installing Office