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Windows 7: Intermittent 100% CPU load, slow down, can't find the cause

01 Oct 2018   #21

Windows 7 HP 64

You did a lot of things. Lets do the basic
Open a CMD window and type
chkdsk c: /f
It will say the disk is in use and if you want to schedule to next start = yes
Pay attention on the results, specially bad blocks or bad clusters. Report.
Back to windows, open a CMD window and type
sfc /scannow
If it find issues, reboot and repeat 2 more times.

My System SpecsSystem Spec
01 Oct 2018   #22

Win 10 x64, Linux Lite, Win 7 x64, BlackArch, & Kali

Quote   Quote: Originally Posted by hazel123 View Post
Yes you can! On the Dashboard turn off the four options on the right and also go through the settings and turn off anything related to the premium version. Anyway you've uninstalled it now but if you reinstall that would be the thing to do - then it's just an on-demand scanner.
UHH, I believe that I said that you can OPT OUT of premium trial during the installation process, and from the GUI if you wish. All it well!

hazel123 good suggestion on the malware tools!
My System SpecsSystem Spec
01 Oct 2018   #23

W7 HP 64 bit

Sorry Only just working out the new Malwarebytes installs myself!
My System SpecsSystem Spec

02 Oct 2018   #24

Win 7 Pro 64 bit


I followed your instructions (thank you),

chkdsk results attached. Sfc /scannow produced a message saying that it did not find any integrity violations.

Not sure what to try next...

As mentioned earlier, is it not strange that I can't see the CPU-hogging task at the top in Process Explorer or ProcessHacker when the CPU in Task Manager is showing 100% and everything has slowed down to a crawl?

Further suggestions welcome.


Attached Files
File Type: docx Chkdsk results.docx (11.3 KB, 2 views)
My System SpecsSystem Spec
02 Oct 2018   #25

Win 10 x64, Linux Lite, Win 7 x64, BlackArch, & Kali

Have you tried viewing running processes with
WinDirStat - Windows Directory Statistics
My System SpecsSystem Spec
02 Oct 2018   #26

Windows 7 HP 64

Your disk is healthy and if System File Check didn't find any issues, Windows is also fine.
Did you check Task Scheduler to see what programs are loaded from it?
My System SpecsSystem Spec
02 Oct 2018   #27

Win 7 Pro 64 bit

Attached is a screenshot of the scheduled tasks under 'Task Scheduler Library'. I'm not sure if this is the full list as the display window doesn't seem to have a way to scroll down

G2M is the GoToMeeting conferencing client.

I guess I could try disabling some of these scheduled tasks, but I am wondering what happens about getting essential updates to the various applications.

If I expand the Microsoft > Windows folders there are many scheduled Microsoft tasks. I have disabled some relating to Customer Experience Program (as per attached instructions) but I have no idea which others should (safely) be disabled.

I can't help feeling that there must be some tool which will tell me the task(s) or process(es) which are hogging the CPU so that I can target effectively, rather than disabling things more-or-less at random and hoping for the best.

There was the suggestion to use WinDirStat to find out more. I've installed this program, but it seems to be more about disc activity diagnosis rather than CPU. As mentioned in an earlier post, ProcessExplorer and ProcessHacker don't seem to show the cause :-(

Any thoughts on other diagnostic tools, or other steps to take, would be welcome.


Attached Files
File Type: docx Scheduled Tasks.docx (54.9 KB, 6 views)
File Type: docx Disablingg scheduled tasks.docx (46.9 KB, 2 views)
My System SpecsSystem Spec
03 Oct 2018   #28

Win 7 Pro 64 bit

Further observation: when the CPU load jumps to 100%, usually the fan also speeds up instantly.

Just a thought: could this be a problem with the BIOS? (Seems unlikely as the computer has been OK for years and I don't think that the BIOS is prone to getting corrupted... But the investigations into Windows problems don't seem to be leading anywhere.)
My System SpecsSystem Spec
03 Oct 2018   #29

Windows 7 HP 64

When the CPU goes to 100% it generates much more heat and then the fan speeds up to keep it cool. That is how it should be.
There are update tasks that are scheduled to do run many times a day. Set to run once a week.
Try to Disable all them to see what happens (open the task - Trigger tab - double click on the trigger and on the bottom there is a Enable box- un mark it

Please attach the images directly to the post. Use the paper clip- browse to the image file - upload
My System SpecsSystem Spec
03 Oct 2018   #30

Win 7 Pro 64 bit

To clarify, please: Are you talking about disabling all the Windows scheduled tasks? There are many of them (see attached image) and it will take a while to go through them and disable them all.

Also, I'm concerned that I may 'break' Windows and make the machine unusable if I disable too much that is core to the operation of the system.

In my thinking, I keep coming back to the concern that I haven't really diagnosed the problem in that the CPU jumps to 100% but ProcessExplorer and ProcessHacker do not show the task or process that is occupying the CPU. Isn't this a bit unusual - and is there some other diagnostic tool that will show what the CPU is so busy with?


Attached Thumbnails
Intermittent 100% CPU load, slow down, can't find the cause-windows-schedduled-tasks.png  
My System SpecsSystem Spec

 Intermittent 100% CPU load, slow down, can't find the cause

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