Recently I attempted to setup an editor to connect to GWB. Until this post I used MS Word 2007 to post to GWB, as I was unable to get Windows Live Writer to install. WLW consistently gave the following error when installing:
There was a problem with this installation. Windows Live Suite was not installed. Code: 0x800070643.

I tried a number of steps to resolve this with MS's Help:
- Ran the installation outside my firewall, while downloading the executable to disk first. I also stopped my OfficeScan Debugger (as best as I can tell), as well as Windows defender while installing.
- Unregistered(("%windir%\system32\msiexec /unregserver") and re-registered(%windir%\system32\msiexec /regserver") Windows Installer.
- Ran the Windows Installer Cleanup from here (although now Windows Live components were found).
- Installed Windows Live Imaging Component and SQL Server 2005 Compact - (Actually MS recommended those two steps, I am not certain why)
- Finally the step that I suspect worked was to remove some left over registry keys:
reg query "hklm\software\microsoft\windows live"
reg query "hkcu\software\microsoft\windows live" << Listed some entries
I deleted the entries from the registry using:
reg delete "hkcu\software\microsoft\windows live" - MS did also provide a link to the actual MSI file but this was not run until step 5 was run.
In the end it took a lot of work to get this installed. I suspect the culprit was the leftover registry entries. In any case I am using it now, and I do like it better than MS Word.