Malaware

Hi,
I am still getting malaware(?) pop ups on web pages, ie a word changes colour and when you hove mouse near it, it brings up an ad, mainly on how to earn more money…
Anything avast can do? I have purchased to full , all protect version with licence.
I have run a scan

If you can either give the details on the alert, change http to hXXp on any URLs that you post to suspect sites.

Or attach a screenshot of (just) the avast alert window.