Repair Microsoft Excel. Try a third-party tool to repair the Excel file. 1] Run Excel in Safe mode and disable add-ins This issue turns out to be caused due to a problematic add-in installed in Excel.

If bugs and issues are preventing you from working on your Excel spreadsheets and Word documents, you may want to try Safe Mode.

A start-up file accessed by Excel during spreadsheet loading can cause Excel to hang or slow down. To find out if this is the problem, open Excel in safe mode.