If the UAC prompt window asks for administrator password when you try to install a software etc, and the Yes button is disabled, you might have lost administrative privileges on your user account. Here's how you can restore them.
- Press the Windows key + S combination on your keyboard to open the Windows Search bar.
- Type recovery to open the Recovery Options.
- Under the Advanced Startup section, click the Restart now button.
- Under Choose an option, click on Troubleshoot.
- Click on Advanced Settings, and then click on Start-up Settings. Click the Restart button.
- Press the number 4 button on your keyboard to boot to Safe Mode.
- Login with the built-in Administrator account.
- Type cmd at the Windows Search bar and press Enter to open the Command Prompt.
- Type netplwiz and press Enter to open the User Account settings window.
- Select your user account, and click on Properties.
- Navigate to the Group Membership tab.
- Select the Administrator option and click OK.
- Restart your computer.
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