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Ekrn.exe - excessive CPU Time

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I have a client, to whom I recommended ESET Internet Security.  (One of many that I've recommended ESET to over the last 15 years.)  This is perhaps the first time I've seen this, but I do find some other topics on this forum and elsewhere about it.  On her computer, ekrn.exe is using anywhere from 50% to 75% CPU time, as far as I've seen so far.  It does slow her computer down to a crawl at times.  I need a solution to this, or I will have to find a substitute for this client.

I've been unable to determine what ekrn.exe is doing to need so much CPU time:  It's not doing a lot of disk access; it's using about 166 MB of RAM, about normal in my experience.  It seems to run around 40 threads.  

Need some input here.

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- Is ESET the only AV installed? Isn't Malwarebytes installed as well?
- Is msmpeng.exe among running processes?
- Does temporarily pausing real-time protection make a difference?

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