Windows service host using 100% of cpu randomly

I have noticed that seemingly randomly my computer will grind to a complete halt and I had no idea why. The problem first appeared when I was watching netflix and it would cause the video to completely halt and for fragmented sounds to play. Later it started
to happen even when I was just using my computer to move documents around or browse the internet. I have done a few SFC /scannow and also scanned my computer for various malware with different programs including bitdefender and spybot.
I have not installed any new programs that I noticed that caused a problem the problem appears to be mainly caused by service host:local service (4). I stopped windows from auto updating but the problem still persists so I re enabled it. Any help you could
offer I would greatly appreciate.
Ps: I remember reading about this being caused by a corrupt driver, I did a SFC /scannow and found a violation that could not be repaired initially but I ended up being able to repair it after restarting. (Not
sure why this is all mini)

Hi,
Many factors can cause a high CPU (SVCHOST.EXE), auto update is only one of the possible causes. I sugegst you refer to the following link for troubleshooting, you can use Process Explorer to view the detailed process.
This is the download link
http://technet.microsoft.com/en-in/sysinternals/bb896653.aspx
Reference links
http://blogs.technet.com/b/yongrhee/archive/2012/06/28/how-to-troubleshoot-service-host-svchost-exe-related-problems.aspx
http://blogs.technet.com/b/askperf/archive/2009/04/10/prf-high-cpu-svchost-exe.aspx
Yolanda Zhu
TechNet Community Support

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My MVP Profile: http://mvp.microsoft.com/en-us/mvp/Lawrence%20R%20Garvin-32101
http://www.solarwinds.com/gotmicrosoft
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