Why am I getting constant pop-ups and random redirects?

Hi everyone,
I’m dealing with a major headache—every time I try to visit a website, ads just start popping up everywhere. It’s not even a matter of them opening in a new window; the browser literally kicks me off the page I'm actually trying to read and redirects me to some random ad or another site entirely!
Does anyone know how to fix this? It is beyond frustrating—honestly, at this rate, I might just throw my computer out the window.
Thanks in advance!

First off, if you can't handle this, maybe computers aren't your thing. Try running AdBlock Plus and AdwCleaner first.