Windows Defender 0x800106ba

Discussion in 'Windows Vista Security' started by Sven Pran, Mar 4, 2009.

  1. Sven Pran

    Sven Pran Guest

    My daughter suddenly experiences: Windows Defender: "Error Code 0x800106ba
    Application failed to initialize"

    This is a fairly new machine (running Vista Home Premium) and it was
    delivered with McAfee virus protection installed. The initial McAfee license
    is about to expire so she renewed that license for a permanent licence
    today. There may of course be a connection here, but I fail to see what that
    connection could be.

    She was guided to which suggests to
    initially remove (uninstall) Windows Defender and then reinstall it. The
    only problem with this is that Windows Defender is not included in the list
    of installed programs that can be uninstalled, and when she tries to
    "reinstall" it Windows Defender is reported as already present on the

    I checked on my own system where Windows Defender is running without any
    problem, and the same applies here: Windows Defender is not listed among
    installed programs.

    I shall be most grateful for comments and/or suggestions that can aid our

    regards Sven
    Sven Pran, Mar 4, 2009
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  2. Sven Pran

    Rojo Habe Guest

    Windows Defender doesn't appear in the list if you have Vista because it is
    part of the operating system. That KB article fails to mention which OS it
    pertains to but you can't reinstall Defender that way in Vista. Try using
    System Restore to return the system to a point before it started happening.
    The following article describes how to do this:

    I note the only other option it gives is to reinstall Windows. You can do
    this by running the Setup disc from within Windows and "upgrading" it over
    Rojo Habe, Mar 4, 2009
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  3. Sven Pran

    Peter Foldes Guest

    Peter Foldes, Mar 4, 2009
  4. Sven Pran

    Sven Pran Guest

    Thanks for the comment. However I am still worried because KB935511 refers
    to installations where Windows XP has been upgraded to Vista. This computer
    has to my knowledge never had Windows XP, it was delivered (from DELL) some
    six weeks ago with Vista pre-installed.

    regards Sven
    Sven Pran, Mar 4, 2009
  5. Sven Pran

    Sven Pran Guest

    Thanks for your comment, but did you read my OP? KB 931849 is the very
    article we tried without success to apply!

    Sven Pran, Mar 4, 2009
  6. IF the McAfee 'thing' has it's own spyware component then Defender is
    Disabled. Thus, the error message.

    QED: What is the McAfee product installed ?
    Check it's User Guide to see if there is a spyware component included.

    MowGreen [MVP 2003-2009]
    *-343-* FDNY
    Never Forgotten
    MowGreen [MVP], Mar 4, 2009
  7. Sven Pran

    Sven Pran Guest

    Thanks for this information, I shall check exactly what features are
    included in McAfee on my daughter's computer.
    (I know that it has antivirus protection and a firewall.)

    Now the interesting question: Is this "error" message something my daughter
    has to live with or can it be disabled in any way (if McAfee includes the
    appropriate protection)?

    regards Sven

    Sven Pran, Mar 4, 2009
  8. You're mowst welcome, Sven. If whatever Version of "the" McAfee contains
    an antispyware component, [the Versions installed by OEMs usually are
    suites that do include this ] then Windows Defender should have been
    disabled when McAfee was installed.
    IF that is the situation, then you can turn WD off manually:

    MowGreen [MVP 2003-2009]
    *-343-* FDNY
    Never Forgotten

    MowGreen [MVP], Mar 6, 2009
  9. I'm having the same problem on
    1. a brand new laptop bought last night.
    2. a pc that I just reinstalled Windows Vista on.
    Both have McAfee installed and fresh Vista install. I will follow the
    notes in the article to manually turn off WD.

    But my question is, if I do this, how do I get to the Startup to turn things
    on or off that I don't want to start on reboot? Is there another means to
    get to this? If there is, then I have no problem turning WD off, but if
    there isn't then I need to resolve the error.

    Thank you

    Christine Williams, Mar 14, 2009
  10. Ok, this article on how to turn off Windows Defender is not going to help
    someone getting this error because you have to go into Windows Defender
    according to the article to turn it off. If you are receiving this error,
    then you cannot open Windows Defender.

    Need another plan....

    Thank you

    Christine Williams, Mar 14, 2009
  11. Click Start
    In Search - services
    Click on Services in the list
    You will now have a list of services on the pc
    Scroll to Windows Defender and it will say Manual
    Change it to Automatic and Start it then
    Reboot and the message is gone from both of my computers.....

    Christine Williams, Mar 14, 2009
  12. Sven Pran

    fshaia Guest

    fshaia, Mar 15, 2009
  13. Sven Pran

    fshaia Guest

    Thank you this worked for me !

    fshaia, Mar 15, 2009
  14. Excellent!

    Christine Williams, Mar 16, 2009
  15. Sven Pran

    Geoffhar Guest

    This morning at 0450 Microsoft downloaded a new set of definitions an
    Defender now works hine - Hooray
    Geoffhar, Mar 16, 2009
  16. Sven Pran

    Rojo Habe Guest

    Don't worry too much about the upgraded-from-XP thing. I only really
    pointed you at that article because it shows you haw to do a System Restore.

    System Restore is always a safe bet because it creates a restore point
    before it restores anything, which makes it undo-able. You just have to
    know when the problem started happening so that you can go back to a time
    before that. The second method, reinstalling Windows, sounds a bit more
    drastic and you might be wise to seek further advice before resorting to
    this, although I'm told an in-place upgrade isn't anything to fret too much
    Rojo Habe, Mar 17, 2009
  17. Sven Pran

    Jay Guest

    Christine, you are my hero (heroine?)! I read many other web pages on this
    problem and none resolved it as you did. Most simply point to the same
    inapplicable KB articles. Way to go!
    Jay, Mar 19, 2009
  18. Sven Pran

    djtito Guest

    hi sven i had the same problem as you.i've managed to solve it after hours searching for the solution and HERE IS YOURS!!
    go to "start>control panel>administrative tools>services" scroll down and locate Windows Defender,click once on it and then click start on the left pane that looks like a 'Hyperlinked' start underlined and in blue
    once you have done that you can go back to start>all programs>Windows Defender,open it (i wasn't able to even do this as this error code kept popping up) and untick all the boxes.don't panic your Mcafee will protect you from everithing that W.D. is supposed to
    and that should be the end of your problem!!

    Post Originated from Vista Support Forums
    djtito, Mar 24, 2009
  19. Woohoo! I'm a heroine!

    I looked everywhere for a solution to this problem and NONE of the articles
    on the Microsoft site helped me.
    Glad to help someone else!!
    Christine Williams, Mar 26, 2009
  20. Sven Pran

    kelly oomen Guest

    Bought a Dell in Dec... Mcfee was installed but then I reinstalled
    I agree with your fix but here is the problem with that
    Lets say that for me the last day was the 24th
    You still have mcfee to deal with and this will happen all over again?
    Or do you think it worth the try before we reinstall?
    Is there so kind of a conflict between vista and Mcfee!
    vista does not like virus protection?
    kelly oomen, Mar 26, 2009
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