Quick question. I'm no computer guy, so bear with

Quick question. I'm no computer guy, so bear with me. Why does the nFusz website lock up my computer (desktop) when I log on to it? It won't let me exit the page or click on anything. I was trying to show a friend the company, but I just kept getting a pop up with no message in it over and over no matter what I did. Any certain settings I need to adjust? Thanks in advance.