keep getting ads pop up in middle of screen when on net/trying to buy things

Hi
My mum who isn't very technology savvy has said to me that yesterday and today she keeps getting ad's pop up in the middle of the screen when she was on Amazon and other sites, I assume it's a tracking cookie/pop up, she uses internet explorer, how is best to stop this from happening?

Thanks in advance

PS - they use windows 7

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