Error has occurred:Class not registered when using mail merge in Word 2010

Question

when using wood 2010 to do a mail merge I receive the Message - Error has occurred:Class not registered.

Answer 1

Repair Office 2010 and check if it works fine:

http://office.microsoft.com/en-us/word-help/repair-or-remove-office-2010-HA010357402.aspx

If the above step does not fix the issue then uninstall Office and reinstall it and check if it helps:

To uninstall Office:

Click on Start< Control Panel< Programs and Features< right click on Microsoft Office 2010 and click on Uninstall.

Note: Ensure that you have the disk and the product key for Office 2010 before uninstalling it.

Answer 2

when using wood 2010 to do a mail merge I receive the Message - Error has occurred:Class not registered.

Give us more details.  What is the data source?