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.

If the two Excel workbooks have the same name, you cannot open them at the same time. For this, either close one of them and then open the other or change the name of one of them.