Microsoft Windows? Vista Home Premium Edition Upgrade Version for PC (1 Computers) (66I-00021) Logo
Posted on Jun 24, 2010
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How to fix error code 646 microsoft windows vista home premium software

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  • Expert 214 Answers
  • Posted on Jun 24, 2010
Anonymous
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* The solution, in a nutshell, is to disable your firewall. If you’re using McAfee Personal Firewall Plus, F-Secure Internet Security, Norton Internet Security or another Firewall vendor, see its respective support page for assistance in disabling it (temporarily). If you’re using the built-in Vista Firewall, keep reading.

* Open the Control Panel and select Security.

* Select Turn Windows Firewall on or off.

* Select Off (not recommended), click Apply and then OK.

* Back at the Windows Update screen, click the Try again button.

* The download(s) and installation should start…

* and this time successfully install. If a restart is required, make sure to re-enable your Firewall once your PC restarts.

* Though this solution will work for most Vista Update errors

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Windows Vista Home Premium update error Code 643

You will find a solution here:
(you can change language by changing "/en" to your language code!)

http://support.microsoft.com/kb/976982/en
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The error code 646 will appear when any of the Microsoft office application updates fail to install. Run fixit provided in the below link and then try to install updates.
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http://www.vistaheads.com/forums/microsoft-public-windowsupdate/322548-error-646-a.html read that page, has all the info you need on how to get info and the official MS page to fix it.
Should be able to help you properly
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unblock windows update from windows firewall and from your anti-virus's firewall
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Alright here is what you do.

Go to support.microsoft.com and type the name of the updates that are failing.

Once you download them on your computer, Right click on them, and Run as Administrator. This way, you will not get any errors.
Do let me know if that worked, otherwise, we can find something else.
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It has to do with software you are attempting to install. Please follow this link and read the article relating to it...

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are you using a genuine vista software? Did you turned on the automatic updates?
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