I have had two Windows 7 Security updates fail (KB3004375 & KB3031432) and both have said error 80070490. I have run Mr Fixit and other things suggested by your site as well as sfc scan (Ihope I have these names correct).
All of this lead me to try downloading the Offficial Windows 7 SP1 ISO download, but two days prior to this Digital River was closed down for the OEM version of Windows 7 ...
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