Resolving the "System.Runtime.InteropServices.COMException (0x80040408)" Error

Overview

You may receive this error:

Error: System.Runtime.InteropServices.COMException (0x80040408) could not start QuickBooks.

This error is typically caused by some or all of the following conditions:

  • Vista User Account Control (UAC) is disabled.
  • The logged-in user to the system belongs to the Admin group.
  • The QuickBooks company file you are trying to open is in a Protected folder in a network environment.

Resolving This Error

For Windows Vista, complete the following steps:

  1. Ensure that Vista User Account Control (UAC) is enabled.

      Note

    or more information about enabling UAC, see http://www.howtonetworking.com/vista/disableuac.htm.

  2. Ensure that the user logged in to the system is not an administrator or member of the Admin group.
  3. Ensure the QuickBooks company file is in a public folder in a network environment or a private (Home) folder in a single-user environment.

For Windows XP, complete the following steps:

  1. Close QuickBooks and exit out of SmartVault.
  2. Browse to ProgramFiles > IntuitQuickBooks > VersionComponents > RegisteredUI.
  3. Rename the file UI_sdk_smartvault.SYS to OLD_UI_sdk_smartvault.SYS.
  4. Restart QuickBooks and sign in to SmartVault.
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