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Microsoft has released an update for Microsoft Office 2010. This update decreases installation failures for updates installed on Microsoft Office 2010.


Issues that this update fixes

When you install Microsoft Office 2010 Service Pack 1 (SP1) by using Microsoft Update, you may receive the following error message:

Code 78F Windows Update encountered an unknown error.

If you download and install the SP1 package from Microsoft Download Center, you may receive the following error message:

The installation of this packaged failed.

The Officesuitewwsp1-x-none_msplog.log file that is generated during the installation contains an error message that resembles the following:

Error 1935. An error occurred during the installation of assembly component <component GUID> . HRESULT: 0x80131047.

This update fixes the error message that is reported during the product reinstallation from the Add or Remove Programs item in Control Panel. SP1 does not have to be installed for the error message to appear.

This issue may occur if the Windows Installer encounters a reference to a drive that no longer exists, or to a removable media device that contains no readable media. For example, this issue may occur when the Windows Installer encounters a reference to an empty DVD or CD drive.

How to obtain and install the update

To resolve this issue, download and install the following update before you install Office 2010 SP1.

To get the standalone package for this update, go to the Microsoft Update Catalog website.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Restart information

You do not have to restart the computer after you install this update.


Before you install Office 2010 SP1, put a readable DVD or CD into your optical drive, or connect a USB drive.

More Information

Several root causes may trigger error 1935 or error 78F during the installation of the Office 2010 Service Pack 1 (SP1). Typically, this issue occurs when Office 2010 was originally installed by using a temporary storage device.

For more information about Office 2010 support, visit the following Microsoft Website:

Support for Microsoft Office 2010 and 2007

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