Follow these steps:
  1. Open Excel
  2. Select File > Options > Trust Center > Trust Center Setting > Protected View
  3. Unmark “Enable Protected View for files originating from the Internet”
The following article provides information on how to troubleshoot this issue from Microsoft: Excel opening blank when you double-click a file icon or file name.  

We recommend working with your IT specialist at your school to complete this process, as they are more familiar with your school's setup. 
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