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Windows 7: High CPU usage

31 Aug 2016   #11

Win-7-Pro64bit 7-H-Prem-64bit

Not sure why but anyone is always welcome to pitch in but I doubt instructions will get any easier :)
Good luck

My System SpecsSystem Spec
31 Aug 2016   #12

Windows 10 x64


You could be facing the Windows Update bug, where it scans for updates endlessly, and uses a lot of CPU. The only (temporary) fix for this is to manually download updates from here Search for Windows Updates takes forever? - A possible solution from bottom up, and install them. If any of these updates say they are not applicable, skip them. If any of them require a restart, do so. Keep doing that until it is finished, and then do one final restart, and your CPU usage will come down, and you should be able to check for updates as well

My System SpecsSystem Spec
31 Aug 2016   #13

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1

Well since you seem to be using Anvir Task Manager post a screenshot with cpu usage by svchost.exe windows update service like this:
High CPU usage-anvir-task-manager-free.jpg
Note to other members. Anvir Task Manager installed version may be bundled with Adware/ PUPS.

EDIT: Also post a screenshot showing RAM / CPU usage when the problem is occurring lile ThrashZone suggested.

One easy way to check if it's a Windows Update issue is to stop Windows Update service and then set startup type to disabled. Reboot then see if the problem still happens.

My System SpecsSystem Spec

31 Aug 2016   #14

Win-7-Pro64bit 7-H-Prem-64bit

When you said cpu is high usage isn;t exactly true on your screen shot
Memory was at 50% cpu was at 2%

So look into this as to what was causing the 50% memory loss which was ESet & Chrome mainly being a resource hog :)

Oops forgot Zam.exe your antimalware utility too.
My System SpecsSystem Spec
31 Aug 2016   #15

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1

Agree with ThrashZone on ZAM.exe - mine shows a lot lower.
High CPU usage-resmon.jpg
I'm not sure if this will help but it might be worth a try. Grab a copy of free portable MemHistory Tool.

Extract the files and right click the executable MemHistoryFree.exe then choose run as administrator.

There's a mouse hover activated menu in the top right corner. Change settings so that it does not start with windows.

Then leave it running for as long as you care. An hour might be a reasonable time.

Then take a look at the top processes history list.
High CPU usage-memory-history-tool-top-processes-history.jpg
In the program's folder there's a subfolder named csv that contains a log in .csv format. Open it with your spreasheet viewer and see if it provides any clues. It gives more information than task manager or resource monitor as it shows memory use and load on the system over a period of time. You could even try letting it run all day.
High CPU usage-memory-history-tool-csv.jpg
Also which power plan is being used and have you made any changes to core parking or freq scaling?

EDIT: RE: Trusted Installer. Well you would see it running after a WU reset and reboot,It will run until it rescanned for installed and available windows updates and should stop when finished.

My System SpecsSystem Spec
02 Sep 2016   #16

W7 Home Premium x86 SP1 Build 7601

Thanks a lot for all the replies. I'm really confused because Windows Task Manager says Chrome is causing high CPU but Anvir says it's Windows Update and Windows Management Instrumentation, also with ZAM spiking at 100% every few minutes and Eset spiking at 100% whenever it updates.

I already disabled WU but the problem still occurs. It's weird but Windows Management Instrumentation, inactive with WU enabled, then becomes active when it's disabled with pretty much identical characteristics, 15% CPU spikes every 15 seconds or so. CPU isn't high all the time, occasionally it will be around 1-2% but normally a fair bit higher.

I'm a bit busy today now but I'll provide those screenshots and other info as soon as I can.
My System SpecsSystem Spec
02 Sep 2016   #17

Win-7-Pro64bit 7-H-Prem-64bit

Yea Chrome all by it's self on a 32 bit machine will wear it down to a slow crawl pretty much the cost for speed :)

Having multiple Chrome tabs open is just insult to injury it already has several processes running with one tab.
My System SpecsSystem Spec
02 Sep 2016   #18

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1

Quote   Quote: Originally Posted by edassange View Post
ZAM spiking at 100% every few minutes and Eset spiking at 100% whenever it updates.
RE: Disabled WU. Rules out WU as the cause so re-enable it.

RE: ZAM. What are you settings? Try switching off Pandora.
High CPU usage-zemana-antimalware-premium-.jpg
Also ZAM updates signatures very often. Typically every 5 minutes.

Note: On my machine ZAM program update hasn't always gone smoothly and a fresh install of ZAM was needed. It's happened a few times. You'd need your licence key handy and also need to exit the program then stop and delete the ZAM service before uninstalling using a decent uninstaller (not Control Panel / Add Remove Programs)

RE: ESET. Well I'd expect a spike when updating just the same as any program that launched and made a grab for some RAM.

My System SpecsSystem Spec
03 Sep 2016   #19

W7 Home Premium x86 SP1 Build 7601

Hi all

Regarding Zemana, I'm not using the old AntiMalware Premium. I'm using the new all-in-one AntiLogger 2.21 Premium (processes still say ZAM.exe) which combines the old AntiMalware and AntiLogger Premium programs, so I guess it'll probably be more resource heavy then the old ZAM Premium. Disabling Pandora made no difference - ZAL 2.21 still spikes at nearly 100% CPU every 5 minutes or so (see screenshot below):

High CPU usage-zal-2.21.png

Eset isn't as bad as I thought, spiking at around 50% but not that frequently.

I think the main issue is svchost PID 2756. When Windows Update is enabled, it appears as below, spiking at around 15% CPU every 15 seconds or so:

High CPU usage-windows-update.png

When WU is disabled though, Windows Management Instrumentation appears in the Startup description of svchost 2756 as shown below, with identical spiking:

High CPU usage-wmi.png

However, when both of these processes are disabled, the spiking still occurs. In fact, I've disabled all of the other processes apart from Task Scheduler (wasn't able to) associated with svchost 2756, but the 15% spiking every 15 seconds still occurs (Process Explorer shows the same).

So it would seem the process description Anvir gives in the Startup column doesn't necessarily relate to the process that's causing the spiking. I'm wondering if it's some automated task in Task Scheduler that's responsible. I've had a look and there's nothing that runs every 15 seconds.

Any thoughts would be very welcome.

PS - only a few sites seem to be resource hogs - for some reason MalwareTips is one of the worst. I was also reluctant to use Mem History. VoodooShield flagged it as a threat mainly because it wasn't signed. Probably fine but played it safe.

Also, I'm using High Performance power plan, and no core parking or freq scaling changes (that I'm aware of).

I also had one instance of a problematic Zemana update but a clean install, uninstalling with Geek Uninstaller, sorted it. Otherwise just updating via ZAL's UI has been sufficient.

My System SpecsSystem Spec
03 Sep 2016   #20

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1

I'd assume that Zemana Antilogger (now includes ZAM) will still update definitions every 5 minutes just like ZAM does. That appears to be normal.

As for svchost see if these help:

Svchost Process Analyzer


RE: VoodooShield and MemHistory. I use VS Pro ans obviously it's going to flag little known unsigned files as unsafe. That just really means do your own research before running the file.
High CPU usage-sigcheckgui.jpg
Anyway it probably won't help if you don't have a high ram usage problem by one or more particular processes. I'd say spikes are normal but you probably need software that logs all process launches/ terminations and see if you can match times to spikes. Like this:
High CPU usage-processes.jpg
However I can't really recommend the software shown in the screenshot as configuration is a tricky issue to explain. Maybe someone else knows of something that is simple to use?

Anyway since it seems like a service might be reponsible perhaps look at disabling services that you don't need to be running. (svchost is windows grouping services under the same svchost.exe process)

My System SpecsSystem Spec

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