Unknown web pages that on my computer screen?

Hey I've been having issues with my laptop lately. Every now and then a random, unknown and unvisited website would pop up on my computer screen. I could not exit out of it nor click on anything it showed me. It wouldn't show up on my task manager and my Windows Defender would show no signs of a threat when it was on my screen. I cannot see most of my screen when it is on here because it tries very hard to cover my screen completely. Wherever I move my cursor the unknown page will flicker and I can see my original computer screen for a brief moment. It cannot play over a video and will not appear on my initial login page for my laptop. It was happening maybe once a week, then twice a week, then everyday and now it appears immediately after I open my desktop. I have ran my Windows Defender and I have found Trojan CoinMiners that I keep quarantining and removing but I can't seem to get rid of them nor do I know for certain that they are the root of the problem. Please help me, this is the only way I can do my work and I cannot afford a new computer right now, Any help is greatly appreciated. Thank you.

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