Under the miniscule prism

Error 646

Windows Update Error Code 646

Feature ID not registered

Error 1606 on Event Viewer

Error Code 0x80070646 on Windows Update Log

Synopsis:

 

When installing updates Windows Update ends up with error code 0x80070646 on XP and Error Code 646 on Vista and Windows 7 with an interpreted error message of “Feature ID not registered”.

 

Resolution:

 

This is an error for a User specified environment variable in the registry for %APPDATA% not properly pointing to the correct value or variable.

 

METHOD 1:

 

1.       Manually navigate into the Registry and find the registry entry for: HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerUser Shell Folders

2.       Look for the Value Name of AppData.

3.       Under AppData should be a Value Data of REG_EXPAND_SZ of %USERPROFILE%AppDataRoaming for Vista or W7.

4.       If the Value Data under AppData is %APPDATA% or any other values replace it with:

 

a.       FOR Vista and W7:  %USERPROFILE%AppDataRoaming

b.      FOR XP: %USERPROFILE%Application Data

 

5.       Install Updates. No need to reboot.

 

METHOD 2:

 

1.       Use Command Prompt to modify Registry values. Open Command Prompt in Vista and Windows 7 as Administrator (Elevated Mode).

2.       Type in Command Prompt the following syntax below (take note of each space, quotation and caret symbol):

 

a.        FOR Vista and W7:

REG ADD "HKCUSoftwareMicrosoftWindowsCurrentVersionExplorerUser Shell Folders" /v AppData /t REG_EXPAND_SZ /d ^%USERPROFILE^%AppDataRoaming /F

 

b.       FOR XP:

REG ADD "HKCUSoftwareMicrosoftWindowsCurrentVersionExplorerUser Shell Folders" /v AppData /t REG_EXPAND_SZ /d ^%USERPROFILE^%"Application Data" /F

 

3.       Try to install the updates. No need to reboot.

 

METHOD 3:

 

1.       Merge the embedded file below into the registry.

 

a.       The Registry File is in the package choose the appropriate OS: Download or Direct Link

 

Technorati Tags: ,,,,, Windows Live Tags: Error 0x80070646,Error 646,Error 1606,Windows Update,Error Code 646,Feature ID not registered

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