How to remove pop ups and banners?

[baby2020]

How to remove pop ups and banners?
help. every time i open the any web pages e.g yahoo.com i get this message "congratulations you have won a price ... click to claim prizes" . i think theres a bug in my computer. how to get rid of it?. My anti virus anti pop and ads is on but still popping out even trusted website like the bank of america its showing the same message. im sure its not from those website. it does not pop in my laptop. my desktop is bug

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