Malwarebytes works well and it's free to use. They want you to pay for the full version but you can download it and run it for free. (Just read the instructions as you install it and turn off "start up when Windows starts" so it doesn't sit in your notifications area) It will quarantine any nasty add-ware and general junk on your laptop. I'd bet you'll be pleasantly surprised at how well you laptop works after it's been cleaned.
https://www.malwarebytes.com