i am using microsoft excel 2007 and occasionally get an error message: excel fou

Question

i am using microsoft excel 2007 and occasionally get an error message: excel found unreadable content in "file name .xlsx" do you want to recover the contents of the workbook?"
sometimes i hit yes and it reverts to the last saved version - therefore eliminating all of the work that i have done in the sheet that day.
i do not use complicated formulas - just basic addition and multiokying
it happens in many different files and there is no telling why it happens.
i have looked around and have seen that it might be a 'bug' in the software - anyone know how to get rid of it??
help please - my work is disappearing!!!!

Explanation / Answer

Follow these steps and verify the results:

1. Right click on the Excel file.

2. Go to Properties.

3. In General tab, at the bottom there is an area called Security, click on Unblock.

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