Uninstall anything McAfee.
But I don't think those are real McAfee ads to be honest. Try running Windows Defender and see if it clears it up.
https://support.microsoft.com/en-us/windows/stay-protected-with-windows-security-2ae0363d-0ada-c064-8b56-6a39afb6a963#:~:text=Run an advanced scan in Windows Security&text=Under Current threats%2C select Scan,scan specific files or folders)