Desktop background screen on startup

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Aug 22, 2015
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Our screen went out a while back so we have been connecting our laptop to our tv screen. Yesterday I went to view a PowerPoint presentation and now when I startup my laptop, all I see is the desktop background and no icons or task bar. I can't do anything. When I ctrl alt del the screen goes black and nothing else. What can I do?? Thanks in advance!
 
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