Just refresh! For God’s sake. It might be intuitive to just click that OK button and guess what, it’ll be the start of your computer’s messy state of security.
Rather, refresh your browser and the notification will vanish just like that.
I did this and all my browsers are infected with annoying online ads that won’t let you see anything but ads of goods anywhere. I’m not pleased. So I just deleted my account (if you want a simpler solution instead of reinstalling the Windows OS).
That said, is this the right time to switch to Mac?