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Level 7

Excel 2016 Extremely Slow to Respond When Inserting New Lines

When inserting lines (rows) in a spreadsheet, I get an "Excel Not Responding" message. The new line eventually appears, but it is excruciating waiting for such a simple task, especially when I need to add many lines (rows).  I have performed both the quick fix and longer fix options to Microsoft office, including re-installing Office 2016, but to no avail. Microsoft suggested that perhaps my security software is running a virus scan in the background, but I can't verify that or turn it off. Help!

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