Mitac Mio problems

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Ok I'm new here, and I have a problem with my Mio 8390. On Friday I restarted my phone because the Internet connection seemed slow. But when I turned it back on, instead of my background showing up, a message came up saying : "No home screen layouts can be found. Install a valid home screen layout and then select it using the Home Screen item in Setings." Now everything else seems to be in order but no matter what I do, I can't get my background to show up again. Any suggestions?