In Windows 8, Windows Defender is a built in antivirus software product that replaces Microsoft Security Essentials. Before Windows 8, Windows Defender featured antispyware capabilities and was not offering antivirus protection.

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Windows defender gives error message on windows startup

When I first start up windows, I get this error message every time: Application failed to initialize: 0x80070006. The handle is invalid. Anyone got any ideas what might be causing it, or ...
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53 views

Effect of “windows defender is taking action to clean detected malware”

Sometimes I get this message, but when I look at the history of windows defender, I see nothing. I am scared that windows is mistaking something important for a malware and deleting it without me ...
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717 views

How can I do an Automatic Shut Down after a Windows Defender Virus Scan? Would the Task Scheduler be involved?

I was wondering how I could possibly have my computer automatically shut itself down when Windows Defender is done doing a virus scan. I usually do it at night because I have a Slow CPU and a lot of ...
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42 views

Certain downloaded files take minutes to become usable

I'm on Windows 8.1 Pro, but this problem also happens on my W7 Premium computer. I sometimes download files but am unable to use them for 2-3 minutes after they've been downloaded. It happens ...
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2k views

safe to delete windows defender scan and definition updates folders? Windows 7,8,8.1

It looks like WD keeps a history of all scans and keep older definition files. Is it ok to delete the content of these two folder and let WD rebuild their content. Anyway to disable WD to keep ...
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362 views

Can't Turn on Windows Defender - Error code 8050800d

My friend using an HP pavilion G, running Win7 64 bit version. Recently had to restore to factory defaults, due to unstable operating environment. Reinstalled all updates, to date. Using Windows ...
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245 views

Windows defender thread using 100% CPU

The problem is the following - a thread of windows defender hangs and consumes 100% of one core (viewed with process explorer). It happens only when there is InPrivate IE instance running. The result ...
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2k views

Windows 8 MsMpEng.exe high disk usage, uninstalled Defender, and now AvastSvc.exe

I recently disabled Windows Defender due to MsMpEng.exe randomly spiking up my computer's disk usage. I saw it from Task Manager->Details->I/O read and write bytes. The read bytes go as high as 12,000,...
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448 views

Windows 8 Action Centre Keeps Reminding Me To Turn Virus Protection On

I have not installed any anti-virus software on my Windows 8 as I think that Windows Defender is enough to keep my system protected from any virus attack. However, sometimes my Action Center shows to ...
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67 views

Antimalware Service Executable - Windows Defender Service - Large Network Usage

Antimalware Service / Windows Defender Service is using a large amount of network resources quite often on my machine. I am trying to first pinpoint WHY this is happening, before I move forward with ...
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32 views

Windows Defender - Is it possible to receive an email alert when something malicious is detected?

In Windows Defender, Windows 7 through 10, is it possible to receive an email alert when something bad is detected? If not directly through the software, I wonder if an event log parser may do the ...
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57 views

How to prevent Windows Defender from restarting automatically in Windows 10?

Windows 10 only allows to turn off the Windows Defender temporarily. Is there a way to revert this back to the old manual behavior? I don't want to disable it completely, I just don't like the ...
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Disabling Windows Defender when talking to a given IP

I'm working on complex web application that has a number of behat tests and in the process in running them on a windows 10 vm (specifically the edge test machine as provided by Microsoft via https://...
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122 views

Copying text files causes massive disk load

When I copy text files from one partition to another on the same disk (which is a brand new WD Blue), it takes 10-20 seconds, even, if the size of the file is 120 KB. I suspect that my Microsoft ...
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45 views

set Windows Defender protection in manual mode in Windows 10

I would like to set the Windows Defender protection service in manual mode (NOT disabled completely) so that: when Windows starts it is disabled i can run custom scans with MpCmdRun.exe i can ...
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155 views

Error message: Library not registered: 0x8002801d

I am using Windows 7 and have both AVG and Windows Defender running. Wanted to change the time for the automatic scan but when I went to save got the error message: Library not registered: ...
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163 views

Interaction between Windows Application Experience and Windows Defender leading to 100% disk active time

This has been driving me up the wall for some time, but I think I may have finally caught (one of) the instigator(s) in the act. Solutions already tried with no effect: I have run chkdsk I do ...
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161 views

Whitelist VBScript files for Windows Defender

I've got a ton of VBScript files acting as the glue in my custom workflow set-up. Since upgrading to Windows 8.1, I've found Windows Defender to scan the execution of my custom scripts as well. I ...
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432 views

Windows Defender Resource Usage / Code Integrity Warnings

So, for some context, I'm a little paranoid because a few days ago, I let a friend put together her PowerPoint presentation on my Windows 8.1 Pro N laptop, and when I had looked away for a moment, she ...