Xjx.aperiodicfretted.com pop-ups in your browser are nothing else but the evidence of a serious infection to be enabled and running in your PC. To be more precise, such pop-ups are the result of adware to be currently running in your PC. You may notice that your browser acts really weird. Each time you open it in order to visit your favorite places you will be redirected to all kinds of malicious places in the web. As a result, your computer may become infected even more.