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  1. #1
    Junior Member
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    Default Windows 8 Defender won't update - 80070666 error

    I am running Windows 8 Customer Preview 32 bit but Windows Defender won't update and get 80070666 error. I've searched this problem for a long time and many people have the same problem, still no lucky. Just installed some system utilities on this Win 8 CP, I am not sure if this is related. You guys here must know how to fix it with professional computer knowledge. many thanks in advance.

  2. #2
    Senior Member
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    Default Re: Windows 8 Defender won't update - 80070666 error

    I'm running the 64 bit version I didn't get an error but it rarely seemed to update for me. I installed Avast free.
    Joe

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  4. #3
    Senior Member Medico's Avatar
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    Default Re: Windows 8 Defender won't update - 80070666 error

    See if this answer from MS helps. If not you might have to reinstall.

    Joe, I get sig updates every day.

  5. #4
    Senior Member
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    Default Re: Windows 8 Defender won't update - 80070666 error

    Ted
    I might have been impatient but it seems like when a new one is released you should get a notification right away.
    Joe

Thread: Windows 8 Defender won't update - 80070666 error - Windows 8

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