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Desktop meadow only shows up in task manager when it tells me it's already running and to turn it off 

I really loved this but  I shut down my laptop and when I turned it back and it said it was running and to turn it off in the settings in the corner, but there was nothing there : no mailbox, settings or flowers . I tried to uninstall then reinstall it but now nothing opens at all? I even checked on task manager but nothing appeared when I opened it. 

If you go into a folder called Samperson and go to the bottom there is a thing (idk what the word is) called 'Uninstall' and click on that.