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Defender won't run at startup
  1. #1


    Rojo Habe Guest

    Defender won't run at startup

    I've just noticed that Defender isn't running, even though the Registry key
    (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) is there. The path
    specified by this key (%ProgramFiles%\Windows Defender\MSASCui.exe -hide) is
    valid. I can copy and paste it into a Run box and the process appears in the
    Task Manager (and stays there until I reboot). If I view the System Startup
    page in Spybot S&D the key exists. I've actually changed '%ProgramFiles%'
    to 'C:\Program Files' (without the quotes) to see if it makes a difference -
    it doesn't. If I view the Startups tab in The Ultimate Troubleshooter it
    finds the key but shows File Not Found in the Launch Command field.

    I'm at a bit of a loss. I thought perhaps the permissions had got screwed
    up for either the Windows Defender folder or the executable itself, but if
    that were the case, should I be able to run the command manually? In any
    case, the permissions can't be edited. Everything's greyed out.



    I'm quite happy to run without Defender; I'd just rather be the one who
    decides. I'm concerned that to all intents and purposes it's supposed to be
    running but isn't.

    Any ideas?


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  2. #2
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    Re: Defender won't run at startup

    Quote Originally Posted by Rojo Habe View Post
    I've just noticed that Defender isn't running, even though the Registry key
    (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) is there. The path
    specified by this key (%ProgramFiles%\Windows Defender\MSASCui.exe -hide) is
    valid. I can copy and paste it into a Run box and the process appears in the
    Task Manager (and stays there until I reboot). If I view the System Startup
    page in Spybot S&D the key exists. I've actually changed '%ProgramFiles%'
    to 'C:\Program Files' (without the quotes) to see if it makes a difference -
    it doesn't. If I view the Startups tab in The Ultimate Troubleshooter it
    finds the key but shows File Not Found in the Launch Command field.

    I'm at a bit of a loss. I thought perhaps the permissions had got screwed
    up for either the Windows Defender folder or the executable itself, but if
    that were the case, should I be able to run the command manually? In any
    case, the permissions can't be edited. Everything's greyed out.

    I'm quite happy to run without Defender; I'd just rather be the one who
    decides. I'm concerned that to all intents and purposes it's supposed to be
    running but isn't.

    Any ideas?
    Hi Rojo Habe,

    You might give this a try to see if will allow Windows Defender to run afterwards.

    Unable to enable Windows Defender application in Windows Vista

    Shawn

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  3. #3


    Dave M Guest

    Re: Defender won't run at startup


    Rojo;

    Since you can run Defender manually, I rather imagine your also running
    Windows Live OneCare which by default disables Windows Defender, but
    doesn't remove it. Should you choose to remove OneCare in the future,
    Defender will re-activate automatically and should again run at
    startup.

    http://windowsonecare.spaces.live.co...141!3842.entry


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  4. #4


    Rojo Habe Guest

    Re: Defender won't run at startup

    Nope. Not running OneCare. I do have ESET NOD32 running; I don't know if
    this does the same thing. Interestingly, Security Center tells me Defender
    is running, even though it doesn't show in the Task Manager.

    Having now run it manually (it'll stay resident until I reboot now) I can
    see the last update was on May 1st. This seems reasonably up-to-date, unless
    it updates daily like most other malware software. I'll try not to worry
    about it too much.

    It just seems a bit odd. I regularly used to see the animated taskbar icon
    that showed me it was running a scan. I've not seen that for ages.



    "Dave M" <Dave.M.38yn7d@xxxxxx> wrote in message
    newsave.M.38yn7d@xxxxxx

    >
    > Rojo;
    >
    > Since you can run Defender manually, I rather imagine your also running
    > Windows Live OneCare which by default disables Windows Defender, but
    > doesn't remove it. Should you choose to remove OneCare in the future,
    > Defender will re-activate automatically and should again run at
    > startup.
    >
    > http://windowsonecare.spaces.live.co...141!3842.entry
    >
    >
    > --
    > Dave M
    > ------------------------------------------------------------------------
    > Dave M's Profile: http://forums.techarena.in/member.php?userid=25399
    > View this thread: http://forums.techarena.in/showthread.php?t=962405
    >
    > http://forums.techarena.in
    >

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  5. #5


    Dave M Guest

    Re: Defender won't run at startup


    Only OneCare, not ESET, should have that effect because the Defender
    functions are included in the OneCare suite, and it wouldn't be
    benificial to have two copies of the same Anti-Spyware running.

    I agree it's odd. Some things to check. In WD options you have
    automatically scan my computer, use real-time protection, and use
    Windows Defender checked correct? Task Manager should show both
    processes MSASCui.exe and MsMPEng.exe running.

    Also the following System Services need to be in Started Status for WD
    to run:
    1.Automatic Updates
    2.Background Intelligent Transfer Service (BITS)
    3.Cryptographic Services
    4.Remote Procedure Call (RPC)
    5.Windows Defender

    As to the scheduled scan running, WD uses the System Scheduler, so
    make sure Control Panel > Scheduled Tasks > Advanced > View hidden
    tasks is checked, then see when the last MP Scheduled scan was run,
    also right click that task and attempt to initiate a immediate run of
    the scan. What happens when you do that, does the scan start, and the
    animated icon appear in the taskbar notification area?

    You're pretty current as far as definition updates go, although there
    was one earlier today 5/06. Defender usually updates automatically
    once, sometimes twice a week.


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  6. #6


    Rojo Habe Guest

    Re: Defender won't run at startup


    "Dave M" <Dave.M.3909je@xxxxxx> wrote in message
    newsave.M.3909je@xxxxxx

    >
    >
    > I agree it's odd. Some things to check. In WD options you have
    > automatically scan my computer, use real-time protection, and use
    > Windows Defender checked correct? Task Manager should show both
    > processes MSASCui.exe and MsMPEng.exe running.
    >
    All those options are indeed checked. MSASCui.exe is running, but only
    because I launched Defendr manually to check the settings. MsMPEng.exe is
    not running. I can't even find this file on my system. It's not in
    System32 and a Windows Search of Everywhere comes up blank (although this
    happens more often than no, whatever I'm searching for).

    > Also the following System Services need to be in Started Status for WD
    > to run:
    > 1.Automatic Updates
    > 2.Background Intelligent Transfer Service (BITS)
    > 3.Cryptographic Services
    > 4.Remote Procedure Call (RPC)
    > 5.Windows Defender
    >
    Automatic Updates isn't even listed in Services. Windows Update is set to
    install updates automatically, but now I think about it I can't remember the
    last time I saw this happen either. All the other services you mentioned
    are Started, although Cryptographic Services is set to Manual rather than
    Automatic. Is this OK?


    > As to the scheduled scan running, WD uses the System Scheduler, so
    > make sure Control Panel > Scheduled Tasks > Advanced > View hidden
    > tasks is checked, then see when the last MP Scheduled scan was run,
    > also right click that task and attempt to initiate a immediate run of
    > the scan. What happens when you do that, does the scan start, and the
    > animated icon appear in the taskbar notification area?
    >
    Last Run Time: Never. Right-clicking and selecting Run has no visible
    effect whatsoever, although since doing it this post lost focus a couple of
    times as I was typing this, so presumably something tried to happen.

    I'm just in the process of running sfc /scannow but the last time I ran it
    (a couple of weeks ago) it didn't find any problems. I'll post again if it
    finds anything.


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  7. #7


    Dave M Guest

    Re: Defender won't run at startup


    Rojo;

    There's a couple of problems at least. MsMpEng.exe (WD scan engine)
    should be in the Program files/Windows Defender folder. Seems like
    Defender got hosed at some point. Can you try a repair install if your
    running XP
    (I don't think you're running on Vista where this won't work):
    Control Panel > Add/Remove > highlight Windows Defender > click Support
    Info > click Repair.
    That should fix Defender without having to re-install completely.

    Look at this post for your automatic updates service missing problem:
    http://www.aota.net/forums/archive/i...p/t-17881.html
    Crypto service in manual mode is just fine.

    I wonder why you got so many problems showing up at once? Did that
    machine have an infection in the past that got cleaned up?


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  8. #8


    Rojo Habe Guest

    Re: Defender won't run at startup


    "Dave M" <Dave.M.3926ze@xxxxxx> wrote in message
    newsave.M.3926ze@xxxxxx

    >
    > Rojo;
    >
    > There's a couple of problems at least. MsMpEng.exe (WD scan engine)
    > should be in the Program files/Windows Defender folder. Seems like
    > Defender got hosed at some point. Can you try a repair install if your
    > running XP
    > (I don't think you're running on Vista where this won't work):
    > Control Panel > Add/Remove > highlight Windows Defender > click Support
    > Info > click Repair.
    > That should fix Defender without having to re-install completely.
    >
    Sorry, I should have mentioned I'm running Vista Ultimate. I thought with
    this being a Vista newsgroup I could get away with not mentioning that. My
    fault.

    I've looked in Program Files\Windows Defender and the file is definitely not
    there (or if it is, it's hidden from my user account).

    It's weird. Even with neither of those processes running, Security Center
    reports that Defender is turned on. Windows Update is quite happily
    updating the definitions (I checked again last night) even though the
    Automatic Updates service appears to be missing. It's as though my PC is
    lying to me.

    A quick update on my last post. When I went back into Scheduled Tasks it
    reported the last run time as the time when I right-clicked it and selected
    Run, although the animated icon never appeared in the tray.

    Sfc /scannow found no problems.


    > Look at this post for your automatic updates service missing problem:
    > http://www.aota.net/forums/archive/i...p/t-17881.html
    > Crypto service in manual mode is just fine.
    >
    I'll hold off on that for now, unless you can tell me it's the same for
    Vista. Again, the funny thing is, Windows Update works fine. Even if the
    service isn't listed it must be running.


    > I wonder why you got so many problems showing up at once? Did that
    > machine have an infection in the past that got cleaned up?
    >
    Not to my knowledge. I do seem to remember a long time ago AVG caught
    something, so it's possible. Oh and no, I'm not runnig two antivirus
    programs. I got rid of AVG and replaced it with ESET about a month or so
    ago.

    Other weird things keep happening too. See the following thread for an
    example:

    http://windowshelp.microsoft.com/com...=en-us&m=1&p=1

    I never did sort that one out.

    I'm beginning to think at this stage that an in-place upgrade of Vista on
    top of itself might be my only option. I've been putting that off because I
    don't know how it's going to affect some of my older software (Office 2000,
    Quicken 2004). I had a bit of bother getting them to run properly with
    Vista in the first place. And no, I can't upgrade them at the moment. I
    have clients' spreadheets that are badly written and don't work with Excel
    2007, and Quicken is no longer supported in the UK.

    So, is this the end of the road? Do I need to reinstall Windows? It's an
    upgrade copy, by the way, so I'm really trying hard to avoid reformatting
    and starting from scratch. Will an in-place upgrade do the trick?


    >
    > --
    > Dave M
    > ------------------------------------------------------------------------
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    > View this thread: http://forums.techarena.in/showthread.php?t=962405
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    > http://forums.techarena.in
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  9. #9


    Engel Guest

    RE: Defender won't run at startup

    Hello Rojo,

    You might try this.

    Go to the main Windows Update window and click on "Installed Updates" (on
    the left-hand side of the window, at the bottom), and then remove "Update for
    Microsoft Windows (KB931099)" (only).

    Reboot. Reboot again. (2 Reboots) Go back to Windows Update, and re-install
    the same update, by clicking on the Check for Updates button.

    Other folks may have additional ideas for you; hope this helps a bit, see if
    that helps.

    Let us know how it works ºut.

    Good luck
    - -- ---

    "Rojo Habe" wrote:

    > I've just noticed that Defender isn't running, even though the Registry key
    > (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) is there. The path
    > specified by this key (%ProgramFiles%\Windows Defender\MSASCui.exe -hide) is
    > valid. I can copy and paste it into a Run box and the process appears in the
    > Task Manager (and stays there until I reboot). If I view the System Startup
    > page in Spybot S&D the key exists. I've actually changed '%ProgramFiles%'
    > to 'C:\Program Files' (without the quotes) to see if it makes a difference -
    > it doesn't. If I view the Startups tab in The Ultimate Troubleshooter it
    > finds the key but shows File Not Found in the Launch Command field.
    >
    > I'm at a bit of a loss. I thought perhaps the permissions had got screwed
    > up for either the Windows Defender folder or the executable itself, but if
    > that were the case, should I be able to run the command manually? In any
    > case, the permissions can't be edited. Everything's greyed out.
    >
    > I'm quite happy to run without Defender; I'd just rather be the one who
    > decides. I'm concerned that to all intents and purposes it's supposed to be
    > running but isn't.
    >
    > Any ideas?
    >

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  10. #10


    Rojo Habe Guest

    Re: Defender won't run at startup

    I removed the update and rebooted twice as suggested. Windows Update does
    not offer this as an update if I click 'Check for updates'. Reading the
    knowledgebase article, this update only applies to Windows Defender version
    1.1.1505.0. Mine is version 1.1600.0, so this is probably why the update is
    not being offered.

    In any case, it hasn't changed anything. Worth a try though. Thanks.

    To continue the thread I've been following with Dave M, do I actually need
    MsMPEng.exe in Vista. The reason I ask is: if I kick off a manual scan from
    within the Defender GUI it appears to run fine (although the animated icon
    is still missing from the taskbar).


    "Engel" <Engel@xxxxxx> wrote in message
    news:7BCCB146-1019-4D77-B53C-A686E6A69431@xxxxxx

    > Hello Rojo,
    >
    > You might try this.
    >
    > Go to the main Windows Update window and click on "Installed Updates" (on
    > the left-hand side of the window, at the bottom), and then remove "Update
    > for
    > Microsoft Windows (KB931099)" (only).
    >
    > Reboot. Reboot again. (2 Reboots) Go back to Windows Update, and
    > re-install
    > the same update, by clicking on the Check for Updates button.
    >
    > Other folks may have additional ideas for you; hope this helps a bit, see
    > if
    > that helps.
    >
    > Let us know how it works ºut.
    >
    > Good luck
    > - -- ---
    >
    > "Rojo Habe" wrote:
    >

    >> I've just noticed that Defender isn't running, even though the Registry
    >> key
    >> (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) is there. The path
    >> specified by this key (%ProgramFiles%\Windows Defender\MSASCui.exe -hide)
    >> is
    >> valid. I can copy and paste it into a Run box and the process appears in
    >> the
    >> Task Manager (and stays there until I reboot). If I view the System
    >> Startup
    >> page in Spybot S&D the key exists. I've actually changed
    >> '%ProgramFiles%'
    >> to 'C:\Program Files' (without the quotes) to see if it makes a
    >> difference -
    >> it doesn't. If I view the Startups tab in The Ultimate Troubleshooter it
    >> finds the key but shows File Not Found in the Launch Command field.
    >>
    >> I'm at a bit of a loss. I thought perhaps the permissions had got
    >> screwed
    >> up for either the Windows Defender folder or the executable itself, but
    >> if
    >> that were the case, should I be able to run the command manually? In any
    >> case, the permissions can't be edited. Everything's greyed out.
    >>
    >> I'm quite happy to run without Defender; I'd just rather be the one who
    >> decides. I'm concerned that to all intents and purposes it's supposed to
    >> be
    >> running but isn't.
    >>
    >> Any ideas?
    >>

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