Thursday, May 19, 2011


Fix Error 0x80070646 While Installing Updates.

We are aware of a potential issue you  may encounter with recent Office Security updates.   When installing these updates, the Windows Update control panel returns the error 646 or 0x80070646.

The following gives you even more technical details about error 646 or 0x80070646. The error 0x80070646 or 646 is an MSI installer error that will only occur when the updates are installed via the Windows Update control Panel. 

A KB has been created for the 646 error code that appears when installing Microsoft Office Updates. The KB includes an automated Fix it that corrects the issue. Look at the following KB:

If Windows Installer logging is enabled, the following line should be noted as a symptom:

Error 1606. Could not access network location %APPDATA%\


The problem is potentially a result of an inconsistent/incorrect environmental variable (%AppData%) as shown below:


  • 1. Open the Registry editor.  To do so, Click Start, type regedit in the Start Search box, and then click regedit.exe in the Programs list.In the User Account Control dialog box, click Continue.
  • 2. Navigate to the following registry keysHKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
  • 3. The correct and default value forAppData should be %USERPROFILE%\AppData\Roaming. To change the value, double click on Appdata, then change the string in the value data field.
  • 4. Close the Registry editor, and try again Windows Update again. (A reboot shouldnot be required.)
  • 5. If the problem persists, repeat the steps 2 through 4 with the following registry keys:

· HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\

· HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\


About bench3 -

Haja Peer Mohamed H, Software Engineer by profession, Author, Founder and CEO of "bench3" you can connect with me on Twitter , Facebook and also onGoogle+

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