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.

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.

Solution 1: Start Excel in Safe Mode To fix the Excel slow to respond issue start Excel file in safe mode. To do so follow the steps given in the article: Close Excel completely > hit Windows + R ...

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.