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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103 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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516 views

How can I fix Windows Defender error code in Windows 8.1?

Windows Defender is giving me an error code 0x80073b01 and it will not start. I am not sure if this is caused by the OS language change that I did recently but I did a scan for virsuses with Norton ...
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175 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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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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414 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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72 views

MP Scheduled Scan starting very late, only during usage

In Windows 8.1, (and, I think, 8, 7, and Server going back to 2008) Windows Defender gets started daily by the MP Scheduled Scan task. It is by default set to run when the computer is not in use and ...
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Always ignore eicar test virus for Windows Defender on Win 8.1

I'm a developer and my software is able to scan processed files on demand with a configured virus scanner, if configured. To test this I have different copies of the eicar test virus in different ...