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"Windows Defender needs to scan your system" (or something close to that)


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9 replies to this topic

#1 britechguy

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Posted 02 June 2016 - 06:24 PM

I am repeatedly having this message come up in the message center.  Not daily, more like weekly or a little longer between appearances, and I find it strange.

 

I thought that Windows Defender, like most antivirus programs, was a "set it and forget it" kind of affair where about the only time you'd get any kind of notification was when there was trouble downloading definition updates or a major update to the program itself needed to be installed (which wouldn't happen with WD because that would occur as part of Windows Update).

 

If I click the message and do the scan everything comes up clean, so I'm not concerned that I have viruses or that the system is not being monitored, at least for the most part, but I have not experienced this sort of behavior on machines with Microsoft Security Essentials under Windows 7 nor Windows Defender under Windows 8.1.

 

Any theories about why this is and what, if anything, I should do about it?

 

 


Brian  AKA  Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134 

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#2 JohnC_21

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Posted 02 June 2016 - 06:41 PM

There is supposed to be a Task in Task Scheduler set to have Defender Scan in the background at a scheduled interval. Maybe something is not set correctly there.



#3 opera

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Posted 03 June 2016 - 12:03 AM

Are the Defender scan logs being cleaned with Ccleaner?



#4 britechguy

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Posted 03 June 2016 - 09:01 AM

Are the Defender scan logs being cleaned with Ccleaner?

 

Possibly, and I'll check on that.  Even if they were, why should it make me manually invoke Windows Defender to do a scan it recognizes needs to be done?  That's what makes no sense to me.


Brian  AKA  Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134 

      Memory is a crazy woman that hoards rags and throws away food.

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#5 FreeBooter

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Posted 03 June 2016 - 09:45 AM

Windows Defender regularly scans your PC to help keep it safe. If you want to set your own scan schedule:

  1. Search for and open Schedule tasks.

  2. In the left pane, expand Task Scheduler Library > Microsoft > Windows, and then scroll down and double-click the  Windows Defender folder.

  3. In the top center pane, double-click Windows Defender Scheduled Scan.

    d93950e2-305c-45c2-a144-335aba19b3db.jpe
  4. Select the Triggers tab, and then select New.

  5. Set your time and frequency, and then select OK.

 


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#6 britechguy

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Posted 03 June 2016 - 11:02 AM

Freebooter,

 

             Thanks and done.  But the question remains is why this is not set up already by default.  I know that I've never tweaked anything about Windows Defender and scanning schedule.  It would seem that the default installation should put in a repeated scan on a weekly basis, at a minimum.  None of the Windows Defender tasks in Task Scheduler were set up to run on a recurring schedule, and I'd have expected that the scan would have been and by some mechanism other than my having just done so.


Brian  AKA  Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134 

      Memory is a crazy woman that hoards rags and throws away food.

                    ~ Austin O'Malley

 

 

 

              

 


#7 FreeBooter

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Posted 03 June 2016 - 04:38 PM

Windows Defender may ask you to scan your computer after definition update or you have not scan your computer for long period of time. Make sure to empty Quarantined items.

 

 

"Configure Windows Defender in Windows 8, 8.1 and 10"

 

https://www.winhelp.us/configure-windows-defender-in-windows-8.html


Edited by FreeBooter, 03 June 2016 - 04:39 PM.

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#8 usasma

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Posted 04 June 2016 - 06:34 PM

I have seen this message on occasion - but not with the repeating that you're experiencing.

Is Windows Defender doing it's scheduled scans?

Are the scan settings set correctly?

 

How many Windows Defender tasks do you have in Task Scheduler?  It's located at Task Scheduler (Local)...Task Scheduler Library...Microsoft...Windows...Windows Defender

I have 4: 

Windows Defender Cache Maintenance

Windows Defender Cleanup

Windows Defender Scheduled Scan

Windows Defender Verification


My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able.

- John  (my website: http://www.carrona.org/ )**If you need a more detailed explanation, please ask for it. I have the Knack. **  If I haven't replied in 48 hours, please send me a message. My eye problems have recently increased and I'm having difficult reading posts. (23 Nov 2017)FYI - I am completely blind in the right eye and ~30% blind in the left eye.<p>If the eye problems get worse suddenly, I may not be able to respond.If that's the case and help is needed, please PM a staff member for assistance.

#9 britechguy

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Posted 04 June 2016 - 11:16 PM

I have seen this message on occasion - but not with the repeating that you're experiencing.

Is Windows Defender doing it's scheduled scans?

Are the scan settings set correctly?

 

How many Windows Defender tasks do you have in Task Scheduler?  It's located at Task Scheduler (Local)...Task Scheduler Library...Microsoft...Windows...Windows Defender

I have 4: 

Windows Defender Cache Maintenance

Windows Defender Cleanup

Windows Defender Scheduled Scan

Windows Defender Verification

 

I have those same four, but I could not find a regular scheduled time for the scheduled scan so added one daily around 3 AM.


Brian  AKA  Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134 

      Memory is a crazy woman that hoards rags and throws away food.

                    ~ Austin O'Malley

 

 

 

              

 


#10 usasma

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Posted 05 June 2016 - 07:51 AM

Here's the XML file from the Scheduled Scan on my system:

Interesting, I noted that the task is schedule to run using the "System" account

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.4" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
<RegistrationInfo>
<Description>Periodic scan task.</Description>
<URI>\Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan</URI>
</RegistrationInfo>
<Triggers />
<Principals>
<Principal id="LocalSystem">
<UserId>S-1-5-18</UserId>
<RunLevel>HighestAvailable</RunLevel>
</Principal>
</Principals>
<Settings>
<MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
<DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
<StopIfGoingOnBatteries>false</StopIfGoingOnBatteries>
<AllowHardTerminate>true</AllowHardTerminate>
<StartWhenAvailable>true</StartWhenAvailable>
<RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
<IdleSettings>
<Duration>PT10M</Duration>
<WaitTimeout>PT1H</WaitTimeout>
<StopOnIdleEnd>true</StopOnIdleEnd>
<RestartOnIdle>false</RestartOnIdle>
</IdleSettings>
<AllowStartOnDemand>true</AllowStartOnDemand>
<Enabled>true</Enabled>
<Hidden>false</Hidden>
<RunOnlyIfIdle>false</RunOnlyIfIdle>
<DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>
<UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>
<MaintenanceSettings>
<Period>P1D</Period>
<Deadline>P7D</Deadline>
<Exclusive>false</Exclusive>
</MaintenanceSettings>
<WakeToRun>false</WakeToRun>
<ExecutionTimeLimit>PT72H</ExecutionTimeLimit>
<Priority>7</Priority>
</Settings>
<Actions Context="LocalSystem">
<Exec>
<Command>C:\Program Files\Windows Defender\MpCmdRun.exe</Command>
<Arguments>Scan -ScheduleJob</Arguments>
</Exec>
</Actions>
</Task>

My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able.

- John  (my website: http://www.carrona.org/ )**If you need a more detailed explanation, please ask for it. I have the Knack. **  If I haven't replied in 48 hours, please send me a message. My eye problems have recently increased and I'm having difficult reading posts. (23 Nov 2017)FYI - I am completely blind in the right eye and ~30% blind in the left eye.<p>If the eye problems get worse suddenly, I may not be able to respond.If that's the case and help is needed, please PM a staff member for assistance.




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