I was trying to insert a row into my spreadsheet and I got the message "To
prevent loss of data, Microsoft Excel cannot shift nonblank cells off the
worksheet. Try to delete or clear the cells to the right or below your data.
Then select A1, and save your workbook to reset the last cell used." I have
data in the all the cells, so I don't know what they're referring to because
nothing is blank. What do I do?