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...and the Windows update service is up and running
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...and the Windows update service is up and running

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Have you scanned for viruses/spyware/malware? &nbsp;These have been known to give the same error.
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Have you scanned for viruses/spyware/malware?  These have been known to give the same error.

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This solution works for me!<br />
Thanks
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When I check for update i have this:<br />
Windows Update cannot currently check for updates, because the service is not running. You may need to restart your computer.<br />
Error log:<br />
wuaueng.dll (928) SUS20ClientDataStore: Unable to read the header of logfile C:\Windows\SoftwareDistrib<wbr />ution\Data<wbr />Store\Logs<wbr />\edb.log. Error -546.
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When I check for update i have this:
Windows Update cannot currently check for updates, because the service is not running. You may need to restart your computer.
Error log:
wuaueng.dll (928) SUS20ClientDataStore: Unable to read the header of logfile C:\Windows\SoftwareDistribution\DataStore\Logs\edb.log. Error -546.

Cannot update windows 7 64bit

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.