Flashplayer has been dead for long time now. It is no longer updated or supported. So the message you saw is not coming from your operating system. It is a fake message from your browser trying to get you to download some malware.
The first thing I would do is close the browser and then delete your browser history and cookies. Then reboot your system. Then you should run Windows Defender (assuming you have a Windows machine).
Hopefully, that should take care of the problem. Windows Defender is very good at detecting malware (as long as you keep your Windows machine updated)
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