Okay. This is the latest release this year. I wanted to check to be sure you didn't have an older version of Windows 10.
Two things I want to try just to eliminate them.
- Add a password to the current local account.
- Use the built-in recovery environment in Windows 10.
- Go to Control Panel in the address bar of Control Panel type Control Panel\All Control Panel Items\User Accounts (so replace all the text in the address bar) and press return. This will open to highlight your account details and there should be an option to select to Change password, or perhaps Add password. Select that option and add a password to your current local account.
Be sure you record the password you have chosen and you may have to use a combination of certain characters/number/special characters. Sign out and sign-in again or restart the computer. (Start > Power > Restart)
- Select Start, hold down the Shift key and select Restart. At the Troubleshoot menu select Advanced options > Command Prompt. Does selecting Command Prompt require use of the UAC prompt, or can you enter the Command Prompt without having to select the option? You can close the Command Prompt and exit back to the first option screen and select to Exit and continue to Windows 10, or just power off and power on again.
Report back on what happens with 1 & 2. I'm hoping adding a password to your current local account will correct the UAC message. If not see if you can enter the Command Prompt in the Recovery environment.