Error code 646 Windows Vista update.

I have daily automatic updates. It is a download of Security window, but it always failed.

* original title - on downloads 000646 keeps trying to download every day, but always fails.*

Please use this Microsoft Tutorial:
http://support.Microsoft.com/kb/2258121

If this does not help, please repost in the Windows Update forum:

http://answers.Microsoft.com/en-us/Windows/Forum/windows_vista-windows_update?page=1&tab=no

Tags: Windows

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