Computer Error Fixer: [Solution] Windows 7

Monday, February 22, 2016

[Solution] Windows 7 - Error Code: 646

Windows 7 - Error Code: 646

I am getting the following error message; 00000646 "Windows Update_dt000" What is this? How can it be fixed?

Solutions to the Problem Windows 7 - Error Code: 646

From a Microsoft Support Engineer:
We are aware of a potential issue agents may encounter with recent Office Security updates. When installing these updates, the Windows Update control panel returns the error 646 or 0x80070646. Please note that this is the same issue that you may have
seen since October 2009.

Technical Details:
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. Previous workaround to resolve the immediate problem requires the installation of the update from a standalone package
from the Microsoft Download Center. We need you to stop using this workaround as it does not prevent future Office updates to fail again with the same error.

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%).

Solution:
1.
Open the Registry editor
2.
Navigate to the following registry keys HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
3.
The correct and default value for AppData should be: %USERPROFILE%\AppData\Roaming
4.
Close the Registry editor, and try again Windows Update again.
(A reboot should not 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\

Or, run http://support.microsoft.com/kb/886549 in place of Step # 5.
Teching It Easy: With Windows |ActiveWin |Notebooks |

Microsoft MVP

Boot in Safe Mode:

Open Run command as previously described
Type MSConfig
Click on Boot tab
Tick Safe boot in Boot option
Select Network
Click Apply and OK
Reboot your system

Your system will boot in Safe mode with Networking. You may now try and open Windows Store and should not see any errors.

Recommended Method to Repair the Problem: Windows 7 - Error Code: 646:

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