WindowsUpdate_80070003
The wiki page says this is a common error indicating errors in system files. You might need run the original installer first and try to repair your system. Also be sure you installed the latest updates.
http://windows.microsoft.com/en-us/windows/windows-update-error-80070003#1TC=windows-7[^]
http://winwiki.org/windowsupdate_80070003/[^]
Good luck!
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