What is MsMpEng.exe? Is MsMpEng.exe spyware or a virus?

What are you to do to fix MsMpEng.exe related problems?
1. Run Security Task Manager to check your MsMpEng.exe process
2. Run Registry Booster to fix MsMpEng.exe related errors
3. Run Spyware Doctor to remove persistent malware

Process name: Service Executable
Product: Windows Defender or Windows Defender Service or Microsoft Malware Protection or MsMpEng.exe
Company: Microsoft Corporation (www.microsoft.com)
File: MsMpEng.exe


If you want a detailed security rating about your MsMpEng.exe (and all other running background processes) download the free trial version of Security Task Manager.

Note: Any malware can be named anything - so you should check where the files of the running processes are located on your disk. If a "non-Microsoft" .exe file is located in the C:\Windows or C:\Windows\System32 folder, then there is a high risk for a virus, spyware, trojan or worm infection! Check it out!


Users Opinions

930 users ask for this file. 3 users didn't rate it ("don't know"). 51 users rated it as not dangerous. 1 user rated it as not so dangerous. 9 users rated it as neutral. 2 users rated it as little bit dangerous. 2 users rated it as dangerous.


All comments about MsMpEng.exe:
Tom Safe, STM should update
Oliver Sahr Service-Dienst von Microsoft Windows Defender (Defender soll den PC gegen Spam und Rootkits schützen)  See also: Link
Terry MS spyware program, not dangerous, but useless
Anthony Colley Windows defender file
Windows Defender
Mike It is microsoft windows defender, free to download to
Jeremy Windows Defender  See also: Link
Neo Safe. It is a resource hog when running it full scan but I usually turn the priority to idle when i notice it.
Bill Windows Defender/Windows One Care  See also: Link
This is safe. but more resource consuming
Windows Defender....if you installed it you should know.....hopefully you do....by microsoft!
denise safe -use windows defender to check my system
its a windows defender process
Nicko Windows Defender, eats CPU usage sometimes
Peter process to do with MS Defender  See also: Link
Rubberduck Belongs to "Microsoft Defender" (AntiSpyware-Program) Beta 2
charlie Windows Defender (anti spyware) scanning your PC for threats.
G.A. Taatgen jr. this file is an update-manager. After download Microsoft wants you to restart to make updates work. When you restart problem is solved.
is a process belonging to Microsoft Windows Defender Antispyware. Manufacturer: Microsoft Corp. http://www.microsoft.com/athome/security
Bevan Miller There are way better anti spys around. AVGAS and SpyBotS&D. in its original form (Giant) Defender was good, now it ignores too much crap from MS advertising friends. My PC runs better without it.
Geetesh As its a windows Addin product for Windows security, than it proovs that we do not have any threat from it. But negative comment is when this file starts its process it eats 50 % or more of your system speed, which alternatly slow downs other applications running on your computer, due to which your system performence comes down.
F. Frye It is part of Windows Defender. You can remove it through add/remove programs or other removal tools. It is difficult to set the scan times as it appears to be random on my machine even though I set it for 2 am.
David V Hacker Its the microsoft programs "windows Defender beta 2". It goes to very high levels if it doing an auto scheduled scan.
Windows Defender Process
Beaglex2 part of winxp defender, eats a lot of cpu but only lasts for a couple of mins
Marc J. Miller Part of the Microsoft Windows Defender anti-spyware service
D_B_D MS defender(antispyware beta) absolute cpu hog.
pszczepa Executable is in "C:\Prog ... \Windows Defender\"
Part of Ms Defender Beta. Hogs memory
Jim Robinson resource hog, it causes the computer to stop and then you cannot use it for some time and it also causes continual slowdowns on the computer useless beta from microsoft.
It is the process for Windows Defender. Tends to greatly bog down system resources. Can use up to 99% of your CPU, even when not running. Easy fix is to uninstall Windows Defender.
Hogar Resident part of Microsoft Defender  See also: Link
Ifrit Not a security risk, but can turn itself effectively into malware, eating CPU resources.
vensgal Not Dangerous but consumes more resources. we can try turning off Indexing Service to reduce the consumption.
Windows Defender, takes a lot of resources for little work
Steve Microsoft's Windows OneCare (antivirus and anti spyware)
Paperoga Windows Defender
CPU hogging process
CER Will peg cpu, and hog I/O, may install on servers, causing difficult to find bottlenecks.
Ken Windows Defender is just doing a timed system scan if MsMpEng.exe is taking alot of computer prosessing.
CJ As said, it's Windows Defender... On my machine the I/O is what realy stood out to me... This program had read and written more than all other programs combined...
wer Panda drauf hat braucht defender nicht! da sich dann AVENGINE.EXE mit MsMpEngine.exe "im Wege" sind. Siehe auch mal Security Taskmanager!
Johannes Windows Defender
Some people find it really hogs the cpu almost to the point of the computer becoming unusable. Of course that's when it scans. But it isn't dangerous.
Pinda! Windows def.file
Gooseman It's a process for Windows Defender Spyware program. Safe to end this process.
Windows Defender
H55 windows defender
Calbo Windows Defender. On one machine of mine it eats up to 30% CPU time
ko MS Defender component, do not end while running. If you want, uninstall Defender to solve the problem
Tem Windows did not do a very good job with this one. Disabled my firewall several times
Jim Windows Defender process  See also: Link
Chuck Is Microsoft. Also is known to consume 100% CPU at times.
Bob spyware,
M part of windwos defender
Ed Offenbar auch ein Dienst von Windows Live OneCare
Ben but it hogs up 50% of my Core Duo
hotbar 4.8.4.0
Henry. Not dangerous but annying: it uses 100% of CPU for a few minutes at Windows startup .Windows Defender can be safely deleted. Use Adaware and Spybot instead.  See also: Link

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More process information

Is MsMpEng.exe spyware or a virus, trojans, adware or worm? Is there a known MsMpEng.exe error?


Other Processes

MsMpEng.exe [all processes]