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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36 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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684 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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235 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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206 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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1k 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 ...
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134 views

Windows Defender: Disable real time; keep scheduled and on demand scanning

I just upgraded to Win 10 (RTM build). I have disabled the built in AV's (Defender) real time protection because I do not run it, never did and have never gotten a virus (and I've had a computer for ...
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443 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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64 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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41 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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76 views

Windows Defender Service keeps stopping

Windows defender service keeps stopping all the time. After enabling it, it only runs for a couple of seconds but then stops automatically. I don't know what's the reason but I suspect malware ...
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183 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 ...
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490 views

Recurring event in Event Log: “Windows Security Center Service could not stop Windows Defender”

I have recently set up a new development machine (Lenovo T440p laptop with Windows 8.1 Pro), and this event keeps getting logged to the Event Log (about once every 2.5 minutes): The Windows Security ...