RED X ON SIGNAL BAR PLLEASEE HEELLLPP !!!?

I have tried searching for a fix forever but cannot seem to find one. In the bottom right of the task bar. My signal bar has a little red x on it. When I click on it, it sais, "Currently connected to: Unidentified Network, No network access. But then below that, it sais that my router is connected with full 5 bars. Please help as I am desperate. -Josh