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Windows 7: CPU usage suddenly skyrockets and stays that way


29 Nov 2009   #1

Windows 7 Home Premium x64 SP1
 
 
CPU usage suddenly skyrockets and stays that way

I am having a problem where everything suddenly gets VERY slow. I may be doing anything at that moment; it appears to happen most often when I am surfing the Web with Firefox, but then I do it a lot and this may be just statistical bias. It has happened in other circumstances as well, and likewise, I've had long Firefox sessions without it happening. It is unpredictable - it may happen minutes after I log on, or many hours later.

When it happens and I press CTRL+ALT+DELETE to run Task Manager, just reaching that screen can take several minutes, with the screen all black and the green wheel cursor whirling forever. When I finally get to Task Manager, I see a certain instance of svchost.exe eating up most of the CPU time, as shown in the first screen capture (I caught it at 86% CPU time in this capture, but it can easily reach 99%).

Since svchost.exe is the running shell of a lot of Windows' services, I looked at the running services to see what did that process ID (PID) correspond to. It is a 3-in-1 PID, hosting the DcomLaunch, Plug and Play and Power services, but all three in group DcomLaunch, as shown in the second screen capture.

The only way to get out of this mess is rebooting, as the process will keep going runaway indefinitely, and killing it will result in Windows showing an error message that it has to reboot anyway because the Plug and Play service has stopped running. A scan for malware found nothing.

Any hint as to what may be causing this, and how to solve it? Thanks a lot.




Attached Thumbnails
CPU usage suddenly skyrockets and stays that way-capture1.gif   CPU usage suddenly skyrockets and stays that way-capture2.gif  
My System SpecsSystem Spec
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29 Nov 2009   #2

Windows 8.1 Pro (x64)
 
 

Run Process Explorer (as Admin of course) and double click on the offending process.
Process Explorer

You want to inspect the Threads tab which might reveal some clues for us.
My System SpecsSystem Spec
29 Nov 2009   #3

Windows 7 Pro & Vista Home Premium
 
 

Go to Start > Run,. and type msconfig,. click the startup tab and uncheck everything except for your anti-virus software, spyware detector and personal firewall if you have on.

You can also disable services you don't use nu going to Star > Run ,and type services.msc

Go to Black Viper's site for indformation on sercices:
Windows 7 Service Configurations by Black Viper
My System SpecsSystem Spec
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29 Nov 2009   #4

Vista Ult64, Win7600
 
 

Hi, will you go back into Processes and click on the word Memory at the top of the list,
it will bring all the processes that are using the most of your CPU to the top, and then post that picture,Please.
My System SpecsSystem Spec
29 Nov 2009   #5

Windows 7 Pro & Vista Home Premium
 
 

Yes,. I should have included that
My System SpecsSystem Spec
29 Nov 2009   #6

Windows 7 Home Premium x64 SP1
 
 

OK, I will run Process Explorer (the Sysinternals utility, right?), look at Threads and also capture the Processes screen sorted by memory usage - next time it happens, which is unpredictable.

As for using msconfig to load a minimum configuration, I didn't understand that suggestion. I don't think that will help for a problem that happens intermittently, at unpredictable times, and never straight away at logon. It will probably even mask it. Like, "OK, I've loaded this barebones Windows, now what?"

I already have a lot of disabled services, for example all related to NetBIOS and local networking, since I only have one desktop PC here and its only network connection is to a cable modem and the Internet (which works, as does Bluetooth, for example).
My System SpecsSystem Spec
29 Nov 2009   #7

Windows 7 Pro & Vista Home Premium
 
 

Msconfig can have a lot of useless entries,.

Removing them speeds up your computer because they don't load at startup/

Trust me, there will be less proccess running
My System SpecsSystem Spec
29 Nov 2009   #8
Microsoft MVP

Windows 7 Ultimate 32bit SP1
 
 

I prefer either manual or disabled settings in "Services", rather than msconfg in start up, but each to their own preference.
My System SpecsSystem Spec
29 Nov 2009   #9

Vista Ult64, Win7600
 
 

I would do as reghakr suggests and untick all the boxes, except your Anti Virus, in the Start/ Msconfig,
and then reboot.

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My System SpecsSystem Spec
29 Nov 2009   #10

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by Jacee View Post
I prefer either manual or disabled settings in "Services", rather than msconfg in start up, but each to their own preference.
I agree with Jacee. If you use msconfig, it isnt global, services is. Big difference

Ken
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 CPU usage suddenly skyrockets and stays that way




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