Whilst using Microsoft Update on various Windows and Office products, such as Windows Server; Windows XP and Microsoft Office 2003, you may experience the 0×80070643 error. What this essentially is telling you is that an error occurred during the installation and something has made Windows installer close before the installation could be completed. This error can occur when attempting to update many Microsoft programs and software, it is not restricted to just one or two products. The error is a generic error and so does not require specialist solutions.

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