How to Settle QuickBooks Error Code 80040408 Follow the given solution to fix error 80040408 in QuickBooks: 1. Update QuickBooks The first step in troubleshooting QuickBooks Error Code 80040408 is to make sure that you are running the latest version of QuickBooks.Select "Update QuickBooks" from the Help menu in QuickBooks. Install any available updates by following the on-screen instructions. 2. Register DLL Files Open the “Run” window by pressing the Windows key + R. Type “regsvr32” followed by the name of the DLL file you want to register. The DLL files you need to register are: • C:\Program Files\Intuit\QuickBooks\qbprefs.dll • C:\Program Files\Intuit\QuickBooks\qbupdate.dll • C:\Program Files\Intuit\QuickBooks\qbprint.dll https://www.quickbookstoolhub.co/blog/quickbooks-error-code-80040408/