You need to be more specific about this issue, I still don't have a clear picture how is it happening.
Is it happening in every browser you visit?
Is it happening on every website you visit? This is important. Try to visit several legit websites, like amazon, ebay, virustotal and let me know if it happens there.
How is it manifested, does it open a new tab, there are some underlined words or it opens a window?
Try to take a picture of it.
Is it happening on other devices on your network?
I can't help you unless you describe the problem with more details.