Microsoft Security Essentials is Microsoft's free anti-virus offering.It runs on Windows XP, Windows Vista and Windows 7, but not on Windows 8, which has a built-in AV component.

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Windows 7 hangs with 100% disk activity but only when online

I have the same problem as seemingly many other people here, and I think we might all be experiencing the same issue: a compatibility issue in Windows 7 between hard drive and network controller or ...
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2answers
321 views

MSE and updating

I cannot manually update MSE...I receive error warning 0x8007000d. I have tried rebooting numerous times and checking the firewall but I need advice from someone more knowledgable than myself. Thank ...
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1answer
40 views

Is there a way to disable MsMpEng.exe from monitoring file access during parallel computing operations?

I am using Windows 7 and have a 4-core Intel CPU, and was recently running a 4-kernel parallel computation written in Wolfram Mathematica that accesses a directory on an external hard drive containing ...
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1answer
3k views

Error activating Microsoft Security Essentials

I'm installing MSE on a XP Professional SP3 PC. After the initial install and update, an error pops up: Microsoft Security Essentials cannot start real-time protection This operation has been ...
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1answer
599 views

Msmpeng.exe is Making Me Tear My Hair Off!

msmpeng.exe causes CPU spikes that happen every 15 mins or so, and it has finally got to me. As far as I can remember, I started facing this after installing MS Security Essentials on my Windows 7 ...
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1answer
702 views

MSE v2.0.657.0 (latest) install error 0x80070643

I am having tremendous issues installing the latest version of MSE. The error dialog I am getting during the installation can be observed on the following image: OS: Windows XP Home Edition SP3 ...
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0answers
295 views

Enabling MS Security Essentials blocks port web server

I notice when I enable "real-time production" in MS Security Essentials that my web-service (on port 80) is blocked from outside my machine. I can still access it locally, even with my network IP. ...
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0answers
361 views

Microsoft Security Essentials: keep download scans but disable local activity scans

In Microsoft Security Essentials, I used to disable "Monitor file and program activity on your computer" but enable "Scan all downloads." Now, Microsoft Security Essentials (MSSE) 4.0 removed the ...
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45 views

Prevent Security Essentials from creating a system restore point before definition update?

It is really annoying (and baffling) that Security Essentials always creates a system restore point before updating its definitions. There is no good reason to do this and creating a 2GB restore point ...
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28 views

In Microsoft Security Essentials how do you see the location of the detected threat?

MSE pops up saying the detected item, alert level, status and recommended action but doesn't say where the detected item is located. How do you find out? For example if it's in something I just ...
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26 views

In Security Essentials, how do I enable scanning of files previously restored from quarantine?

I had infected .htm files on a web server. I wanted to see the text of one of the files, so I could see the malicious code myself. However, whenever I would download one of the .htm files to my ...
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736 views

Microsoft Security Essentials: how to disable background scan?

Microsoft recently pushed out an update to Security Essentials via Windows Update. Now when my computer is "idle", MSSE thrashes the hard drive presumably doing a background scan. I don't want this. ...
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458 views

Ran Microsoft Security Essential after malware attack, now Windows won't open

After I was hit by malware (from an email I opened) I downloaded Microsoft Security Essentials. Scanned and and cleared my computer. I shut down for a restart but now Windows won't launch. It gets ...
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85 views

Why does context menu sporadically open behind taskbar?

Sometimes when I'm using Windows, it will go weird—when I try to change window using the taskbar it won't work but the taskbar will flash yellow. Windows will stay weird until I restart (or log off). ...
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0answers
404 views

Security Essentials (SE) hangs while scanning ProgramData folder

First I did a complete scan on C:\ and kept getting (after about 1.5M files scanned, which is at the end of the C:\ProgramData folder or the beginning of the C:\Recovery folder) Then, after ...
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287 views

error 0x80070424 cant update my MSE in windows xp sp2

I was trying to update the MSE using windows xp sp2, but the error says "ERROR 0x80070424" what does it mean it says again "there's no internet connection" .. Can someone help me please?
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530 views

MSE update KB2310138 causes system to hang

A particular system I've been looking at has been having intermittent hanging issues. The system seems to hang on start-up and is generally slow. I restored the system to a state previous to a Windows ...
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196 views

Security Essentials constantly finding Ransom.P trojan in Google Chrome cache

On my Windows 7 PC, Microsoft Security Essentials constantly finds the Ransom.P trojan in Google Chrome's cache. For example, in the file: C:\Users\Denis\AppData\Local\Google\Chrome\User ...
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27 views

Windows 7 Virtual machine maintaining with System Updates and MSE updates

I have multiple VMs (1 for Internet Explorer 6, Internet Explorer 7 and so on -- I know I could use other tools like IETester but that's apart from this question). It is nice to have those VMs, since ...