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I get error # 80070005 whenever I try to update Windows 7 Home Premium 64-bit for the past month and a half. It tells me Windows cannot search for updates. I have tried to use System Restore, but it keeps failing..

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Maybe read through this thread from Microsoft Answers, and see if something works out for you. Seems like a common error, so there are a couple of answers already. – slhck Apr 26 '11 at 12:48
Does it happen for all the updates or some specific ones ? Have you checked windowsupdate.log ? – The_IT_Guy_You_Don't_Like Aug 16 '15 at 15:47

According to this your account may be a member of the Administrators and Guest security groups. There's also the System Update Readiness Tool (SURT) that can help with WU problems.

Here is a bunch of things to try, as well.

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