Error code 646
If you are running an ugrade the error usually comes up but To FIX error code 646: Go to Microsoft download center, and download each
KB number for each download seperately. i.e.
KB974561, etc. they have that number listed on each important update to be installed. As each update is being installed, look for the KB number and write it down. when U have them all, go to the update center and download 1 of 3 then go back to the update center and download the next one, and the next one until done. U can find the downloads by entering "download kb974561 or whatever the real nbr is in the search bar and click go. after U download them all and close down everything, go to the control panel and click on windows update. Instead of showing 3 important updates it may show 2 updates. click install, and it should install them with no more problems. Click on windows update again and it should show your computer is up to date. thats the way out but before doing that make sure you turn off the (UAC) User Account Control. Then run The windows upgrade installation and reboot the computer. all 5 kB patcheswill be installed sucessfully. Remember to turn ON the UAC after the install is completed.
1. Visit Microsoft Download Center: http://www.microsoft.com/downloads
2. Use the IDs of Windows Updates to find the download links. For example, you can use the key word KB972363 to find the link to download update 972363.
3. Download updates from the links and save them to the desktop. Double click on the installation files and install the updates manually.
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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
SOURCE: how to fix error code 646 microsoft windows
* 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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