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Windows 7: how to solve code 646

18 Oct 2009   #11

vista ultimate 32bit

how do i validate my ms office ,sir?

My System SpecsSystem Spec
21 Nov 2009   #12

Vista Home 64 Bit
One Solution for Error Code 646

(11/21/09) - I have Vista (64bit version), and I was getting this error for three weeks myself. Thanks to one the suggestions below, I got it to work. The suggestion that worked for me was to "manually" install each update "individually". I could not use the windows automatic update feature. Here's what I did (BTW, I did not have to turn off my firewall to do this):

1) Went to Bing.Com
2) Typed in the exact name of the update as it was displayed on the Windows Update Screen (e.g. Security Update for Microsoft Office Excel (KB######)
3) Bing found the exact match to what I typed in on the Microsoft website
4) I clicked on the link
5) Selected "Download"
6) And Viola, it worked :-)
7) I repeated this step four more times, and now I've successfully installed all five updates that I'd been trying to install for three weeks.
8) Thanks again to all of the tips people listed below, that was helpful and the "manual" update tip worked for me.

Hope this works for other people as well.
My System SpecsSystem Spec
25 Aug 2010   #13

Windows 7 Home Premium 64 bit


I had the same problem on windows 7, 64 bit and somewhere on this site I found the solution?

Just go to and type in the update number . That is = KBXXXXXXX and display the page and CLICK on DOWNLOAD and manually install it. It seems to be only 4 or more updates that are failing with this error. Just use Windows update history and do the same for all failed updates, reboot and they will all be listed as successful.

It worked for me for about 4 or more failed updates.

Good Luck.

My System SpecsSystem Spec

25 Aug 2010   #14

Windows 7 Home Premium 64 bit

Sorry about re-stating the solution above - this was my first entry on the forum and didn't think to look below at the "HOW TO SOLVE CODE 646" . Oh well, I verified that it does work.


My System SpecsSystem Spec

 how to solve code 646

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