What is MsMpEng.exe please?

  holme 22:13 11 Aug 07

The hard disc occasionally starts thrashing of its own accord and, under Processes, "MsMpEng.exe" eats up to 45% processor power.

It's a System process. Any ideas what it is and what it's doing please? The other, er, 55% is System Idle Process. TIA.

  holme 22:19 11 Aug 07

Sorry, forgot to mention that Defender's automatic scan option is UNticked.

  Al94 22:22 11 Aug 07

Google is your friend click here

  holme 09:14 12 Aug 07

Thanks, but tried that first before posting this query.

Have also tried uninstalling Defender and re-installing a brand-new download.

The problem is: If the Defender daily auto-scan feature is UNticked (confirmed), why does the machine seemingly still run MsMpEng.exe?

Also at a time which is well after start-up (typically more than 1 hour) and in any event not related to the default time set under Defender (02:00). But that's UNticked anyway...

Clearly we're not the only ones getting this hiccup, the Microsoft site has long threads about it.

  birdface 09:52 12 Aug 07

I would wait until Microsoft Up-dates on Tuesday before you do anything drastic,It looks like a problem with Defender and Windows live One care,As Microsoft know all about it I would imagine that a fix would come shortly.

  holme 10:27 12 Aug 07

Hokay, thanks for that.

This thread is now locked and can not be replied to.

Hands-on: Samsung Galaxy S8 review

1995-2015: How technology has changed the world in 20 years

Samsung's beautifully designed Galaxy S8 makes for better VR experiences too

47 iPhone camera tips to help you take better photos