The advice you gave me is exactly what we did both Friday and Monday with the help of the support team. It did not fix the issue. We uninstalled both QuickBooks and Excel multiple times and reinstalled. We also downloaded and installed QuickBooks on my laptop which had never had QuickBooks installed on it prior and still got the same error message. i still believe the error resides in .xlt file and has nothing to do with my installations but apparently reinstalling QuickBooks does not fix the .xlt file.