Hi Тимофей, This is Ramesh.
If the "Yes" button is grayed out in the UAC dialog, it means your user account has lost its admin privileges.
You need to restore your original user account's privileges (e.g., group membership) by logging in as the built-in "Administrator."
Start Windows in Safe mode, and login as built-in "Administrator".
Запуск компьютера в безопасном режиме в Windows - Служба поддержки Майкрософт:
https://support.microsoft.com/ru-ru/windows/%D0...
Login as "Administrator". It has a blank password by default.
Next, change your user account to an administrator account. You can do so via Control Panel → User Accounts → “Manage another account“ → "Change the account type" and set it to "Administrator."
See also:
Lost Administrator Rights in Windows 10/11? Regain Admin Rights:
https://www.winhelponline.com/blog/locked-user-...
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