why are my google searches being redirected to a advertising page, once i click on a search?

Once i make a search and try to click on the desired link, my search is being redirected to a advertising page like yellowpages, local, etc.
why is this happening.
I have run the pc for viruses and nothing shows up, i uninstalled and reinstalled firefox and nothing happens. same thing happens when i use explorer. Ive tried to restore my pc to an earlier date but doesn’t work.
Can anyone make some suggestions on fixing this please.

Thanks

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