Windows 11 — I’ve lost administrator rights OOSeven Zeo

A reliable path that avoids reinstalling Windows is to try the built-in Administrator account first, then use it to restore the main account to the Administrators group.

1. Open Computer Management from Search.
2. Go to Local Users and Groups > Users.
3. Check whether the Administrator account shows a down-arrow icon, which means it is disabled.
4. Double-click Administrator > clear Account is disabled > select Apply.
5. Sign out.
6. Sign in with the Administrator account.
7. After signing in, change the affected account back to an administrator.

Important details for this scenario:

• The symptom where UAC shows only No and no credential option is consistent with there being no usable administrator context available for elevation.
• Since Safe Mode, PowerShell, Command Prompt, and advanced recovery attempts were already tried, using Computer Management to enable the built-in Administrator account is the most direct supported recovery step from the available guidance.
• This approach is intended to preserve personal files because it restores access rather than resetting Windows.

If Local Users and Groups is not available or the Administrator account cannot be enabled from there, the remaining documented fallback in the available guidance is a WinRE reset. That can be started by holding Shift while selecting Restart, then going to Troubleshoot > Reset this PC. Choose Keep my files if personal data must be preserved. This can still remove apps and settings, so backing up important files first is recommended.

References:

• Windows 11
• I don't have Admin privileges on my Windows 11 Pro PC - Microsoft Q&A