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Windows 7 computer has svchost.exe using 50% of CPU

Posted on 2016-09-02
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Last Modified: 2016-09-10
I have one computer that svchost.exe is using 50% of the CPU without any fluctuation.  When the user has web programs open it often uses 100% of the CPU.
It's the President of our company and she is not happy.    HELP!
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Question by:jrsitman
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Expert Comment

by:NVIT
ID: 41782481
Did you try taking Ownership? i.e. Right-click drive D:\ at root. Properties, Security, Advanced, Owner, Edit. "Change owner to" should show the admin name. Pick it. Pick Replace owner on subcontainers and objects. OK.
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Author Comment

by:jrsitman
ID: 41782489
I just did and I'm getting a lot of permission errors.  I'll work on this tomorrow.  

Just curious how does this affect the svchost.exe?
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by:NVIT
ID: 41782496
Oops. I posted on the wrong page (different question). My apologies, jrsitman.
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by:dbrunton
ID: 41782504
Quite possible/probably virus/malware.

Use Malwarebytes  https://www.malwarebytes.com/mwb-download/ (free version) and scan and see what you find.

And try Adwcleaner  http://www.bleepingcomputer.com/download/adwcleaner/ as well.
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Expert Comment

by:NVIT
ID: 41782506
If the above doesn't help and you'd like to try manually cleaning the PC, try my post using AutoRuns by Microsoft (Sysinternals)
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Assisted Solution

by:Dan Craciun
Dan Craciun earned 500 total points
ID: 41782841
Just stop Automatic Updates and svchost will stop hogging your resources.

Use WSUS Offline or similar to update.

HTH,
Dan
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Expert Comment

by:John Hurst
ID: 41782937
It is most likely a virus or other malware. Svchost is very well behaved in a computer that is running properly.

I agree with DBrunton above. Scan with your own AV followed by a scan with Malwarebytes.

Make sure your AV suite is top brand name paid with support.
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Expert Comment

by:jcimarron
ID: 41783096
jrsitman--
svchost often seems to be using a lot of CPU when it is actually the file it is assisting that is causing the problem.  Run Process Explorer to see what files are running under svchost.
https://technet.microsoft.com/en-us/sysinternals/bb896653
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Author Comment

by:jrsitman
ID: 41783105
@jcimarron, I did run Process Explorer.  There were many svchost running.  I'm currently installing updates. After that is complete, I'll check again.
Also I ran Eset (our AV) and Malware Bytes.  No viruses found.  I'll post later today.
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by:jcimarron
ID: 41783141
jrsitman----
"There were many svchost running"
Which was using the most CPU?
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Accepted Solution

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jrsitman earned 0 total points
ID: 41783144
Haven't got that deep into it yet.  However, after the updates were installed, the CPU dropped and svchost is no longer using up CPU.

Your thoughts?
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Expert Comment

by:Dan Craciun
ID: 41783152
See #a41782841 : Automatic updates was using lots of resources.

PS: you're lucky the updates finished so quickly. Be prepared to wait up to 48 hours with the processor at 50%
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Expert Comment

by:John Hurst
ID: 41783154
I have found that Windows 7 up through Windows 10 will see CPU down to < 5% within minutes of updates completing.
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Expert Comment

by:dbrunton
ID: 41783163
If this was a recent install of Windows 7 and the user clicked on the Update button then Yes, you will see 50% CPU utilisation and nothing appears to be happening.  Leaving the computer alone for 24 hours seems to fix the problem as it will get the updates.

However the 100% CPU when browsing is a little different.
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Author Comment

by:jrsitman
ID: 41784128
Not sure how to award points or not award points.  Dan Craciun comment about updates is what made me check them.  However, his post was not actually the solution.

What do you suggest?  Maybe accept my own answer?
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Expert Comment

by:John Hurst
ID: 41784130
Maybe accept my own answer?   In this case, that looks to be the correct approach.
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by:NVIT
ID: 41784166
IMHO, any post that helped you directly or indirectly should be awarded.
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Author Closing Comment

by:jrsitman
ID: 41792495
Just to be clear, the computer needed the updates installed.

Thanks to all for helping.
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