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Error Code:80029c4a Description:Error loading type library/DLL.

When you try to open QuickBooks, you see this error message:


Why this is happening

This error usually occurs when a QuickBooks system file has been damaged or cannot be found. This can sometimes occur when an antivirus has incorrectly marked a QuickBooks system file as being infected with a virus.

On August 15, 2014, Avast! antivirus incorrectly flagged the DMUSERS.DLL QuickBooks file as being infected and quarantined the file. This will cause this error to occur.

How to fix it

Solution 1: Perform an Avast Virus Definition and Program Update:

  1. Right-click on your Avast icon in the icon tray in the lower right hand corner.
  2. Choose Update.
  3. Click Program and follow the prompts to update the Avast program.
  4. Repeat steps 1-3 above and choose Engine and Virus Definitions.

Solution 2: Check your antivirus program for files that have been quarantined.

Click here for steps on checking quarantined files in Avast! antivirus.

For directions for other antivirus programs, please consult your Anti-virus help documentation.  NOTE:  Intuit recommends you contact an IT professional before making any edits to your anti-virus programs.


Solution 3: Perform a clean install of QuickBooks



KB ID# SLN41083
10/13/2015 11:26:19 AM
QYPPRDQBKSWS08 9125 Pro 2015 2ff72b