wrapper.z5x.net is a special pop-up window that comes up in PCs infected with adware program. There are very many of them widely spread today, we can’t tell about any particular one causing this nasty pop-up to appear. But this problem is for sure a very universal one. Millions of PCs in the world these days are infected with many kinds of adware programs. Users as a result of such adware intrusion have to face a lot of annoying things in their browsers.