1. #1
    newboy is offline New Member
    Join Date
    Oct 2015
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    1

    Default Microsoft Security Essentials will not install - 0x80070645

    hi, can any one suggest why Microsoft Security Essentials will not install, I have removed all other av programs with revo uninstaller and cant find any leftovers at all.

    The installer goes through initial stages,but then pops up a error message 0x80070645.

    I am duel booting win7 with win10 , defender is of course allready installed on win 10,Thanks in advance.

  2. #2
    HappyAndyK's Avatar
    HappyAndyK is online now Site Administrator
    Join Date
    Jun 2008
    Posts
    7,280

    Default

    See KB2635095 and run the Fix It mentioned there and then try again.

    This should help!

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