Nothing really, usually just open a new browser window. It's on and off too, like my comp might do this and nothing but for 3 days or something, then it'll be like it's gone for a couple weeks. It usually only happens when I click a link to a page at a certain time or something, then it's like my whole system.. refreshes itself? My desktop will disappear and return, and all my task bar items will vanish then disappear.