If you’ve encountered the warning message “Microsoft Excel: The last time you opened it caused a serious error. Do you still want to open it?”, you’re not alone. Many users are facing the same error when opening their Excel documents. When this error occurs, it means that Excel met a problem the last time it was opened, which caused it to crash or behave unexpectedly.
Causes:
Corruption in the Excel file
Outdated Excel software versions
Due to corrupted or faulty add-ins
Malware or virus infections
Program to quit unexpectedly
Corrupted Office Suite
Insufficient system resources.
Solution:
Reboot your PC
Disable Faulty Add-Ins
Repair Corrupt or Damaged Excel Workbook
By Updating Excel
Repair MS Office Application
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