What is CompatTelRunner.exe on Win10 64-bit and why does it jam up my PC for ten minutes on startup?

I see versions of this question asked in a couple of places, but no meaningful answer from Microsoft. So I thought I would ask it under the appropriate heading for my case:

I run Windows 10 Home 64 bit, and I often get a problem on startup. My hard disk gets hammered for about 10 minutes, and the culprit is CompatTelRunner.exe. At the same time that this process is "scanning" a load of files on my hard disk, it appears to be sending out a large amount of information via my internet connection. This activity slows my PC right down, and sometimes it's so unresponsive I just have to go make a cup of coffee before I can start doing anything with my machine. This is obviously unacceptable, so I'd like some answers please:

(1) What is CompatTelRunner.exe and what is its specific purpose?

(2) Why is it apparently scanning so many files on my hard disk?

(3) What information is it sending over the internet, and to who?

(4) How do I stop it from running (preferable), or how can I allow it to run, but in a way which does NOT cripple my PC for ten minutes on startup?

Thanks for any meaningful help given.

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Hi Keith,


CompatTelRunner.exe is also known as Windows Compatibility Telemetry. This periodically sends usage and performance data to Microsoft IP addresses so that improvements can be made on user experience and fix potential errors. This is normally enabled by default but there is a way to disable it. Kindly check the steps provided by MARCEL SAUCIER on August 10, 2016 on this link.


Feel free to post back if you have further questions.

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Thank you for the help Ar Rom. I have only just found time to try out this tip. I thought I had already searched my PC pretty thoroughly for any mention of CompatTelRunner.exe, but sure enough when I opened the scheduler at the indicated place, there was an entry there to start it!

I have now deleted both entries under "Application Experience", so I hope this will fix things. If the solution works, I will try to remember to report back here and click on "Solved my problem".

Thanks again for the help.

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In the past few days I haven't had any problems when starting Windows. Although I'm not yet 100% confident that the problem has been permanently fixed, I've marked this as solved for now.

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"This periodically sends usage and performance data to Microsoft IP addresses so that improvements can be made on user experience ..."

That's so ironic.

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Last updated June 9, 2021 Views 189,191 Applies to: