How do i get rid of malware?

I recently got a lenovo laptop, and its been pretty good. I downloaded a video from youtube, and ever since then i've been getting pop up ads. I downloaded malwarebytes to run a test, but it said i had nothing to clean. I'm very stressed, how do i get rid of these pop ups?

Download, run the ADW cleaner software.

It will remove malicious software from your computer.

Download link

Could be triggered by a cookie buried somewhere on your HDD - give it a good DEEP cleaning…

If Malwarebytes didn't find anything, you're ok. Go into your browser and restart with add-ons disabled and see if this helps. One of your add-ons may be causing this. Also, go into your browser and prevent pop-ups. Google how to do this for your browser.