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I've used Win7 as a guest with an Ubuntu host in VirtualBox for 5+ years now. Recently, either a VirtualBox update or Win7 update has caused it to peg the CPU at 100% for hours, every time I boot it.

The culprits:

MsMpEng.exe/MsMpSvc

Wuauserv (under svchost.exe)

TrustedInstaller.exe

My reading of tonnes of posts and articles tells me these are all Microsoft's and related to updates and malware scanning/detection. Not things I want to disable.

So does anyone know why these are a problem suddenly, and what should I do about it? The Win7 instance is unusable until they finish.

  • you may want to try clearing the windows update cache: coffeebreath.org/d/content/… – Frank Thomas Feb 16 '15 at 22:01
  • provide a xperf trace of the CPU usage, so that we can see what thoe services do: pastebin.com/4h2ySm1V – magicandre1981 Feb 17 '15 at 5:58
  • Thanks. I've flushed the update cache twice, no effect. – Greg Bell Feb 18 '15 at 2:41
  • After battling with this for three weeks (I didn't post to superuser quickly), I've finally got it quiet. I did three things - 1) ran Malware Bytes which found something spyware-like that shouldn't have been it, 2) Turned off VBox's sound, networking, and share, 3) Installed a new round of updates. Not sure which did the trick. If it stays quiet for a few days, I'll post more. It usually happens after the system's been off for a few days. Thanks for the xperf tip. Will do. – Greg Bell Feb 18 '15 at 2:44
  • post this as answer. TrustedInstaller.exe is called by WindowsUpdate (Wuauserv) to list all install updates, this is used to detect which updates are needed to be installed. So if you installed new updates, this is gone until next months patchday. – magicandre1981 Feb 21 '15 at 7:54

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