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Microsoft won't fix Windows 0x80070643 errors, manual fix required
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
I have run the script with mostly success. A few computers had the script fail because WinRE was corrupt, or missing, or whatever. You would think that if WinRE wasn't present, the update would be skipped and not repeatedly notify you that it failed, but that's Microsoft for you.