What is CompatTelRunner.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the CompatTelRunner.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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CompatTelRunner.exe file information

The process known as Microsoft Compatibility Telemetry belongs to software Microsoft Windows Operating System by Microsoft (

Description: CompatTelRunner.exe is an important part of Windows, but often causes problems. The file CompatTelRunner.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 67,816 bytes (35% of all occurrences), 37,096 bytes and 6 more variants. 
The CompatTelRunner.exe file is a Windows system file. The file is a trustworthy file from Microsoft. The program is not visible. It is digitally signed. Therefore the technical security rating is 0% dangerous; however you should also read the user reviews.

Uninstalling this variant: In the event of any problems with CompatTelRunner.exe, you can do the following:

Recommended: Identify CompatTelRunner.exe related errors

Important: Some malware disguises itself as CompatTelRunner.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the CompatTelRunner.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Necessary for Windows 10 (installed with kb2977759): "This update performs diagnostics on the Windows systems that participate in the Windows Customer Experience Improvement Program. These diagnostics help determine whether compatibility issues may be encountered when the latest Windows operating system is installed. This update will help Microsoft and its partners ensure compatibility for customers who want to install the latest Windows operating system."
  No_W10   (further information)
Uses tons of CPU and IO on occasion, however, is made by Microsoft and comes with windows.
If a file is signed from microsoft NEVER delete it, Doing so may cause system instability and possibly break windows. I have never had any issues with this process and so have no reason to delete. The only way this process could be bad is if you have obtained a Rootkit which is unlikely.
It does a lot of disk activity on my Win7-64, as it analyses hundreds of files per minute. Might be part of some scheduling task. I also know that advice is hilarious, as you can read above: "uninstall the software Microsoft Windows"
  Pedro Lucas  
it has a really high disk rate usage of 10 - 20% in the task manager.
It's garbage. Windows is forcing telemetry onto users now. It's nothing but telemetry crap. Take ownership, change permission to full, delete the file.
  Sick of MS's Hijacking Crap  
Seems important but causes sky-high CPU and Disk usage.
My installation folder for Rocket League was locked, I could not change the permissions. Using Lockhunter I established that Compattelrunner was preventing access. Once I terminated it access was regained.
Well.. it is invisible as being installed viewing installed programs in control panel. That makes it suspicious if not dangerous.
  Ronald Duck  
Legit program from Microsoft for Windows. However, it caused constant high disk usage, significantly crippling my laptop. Disabling it in the task scheduler rather than deleting it solved the problem and there seems to be no repercussions.
Spyware from Microsoft. Will continue to run despite shutting it off in the computer settings. While not dangerous, it's a nuisance, and should be removed.
86,368 bytes here. Huge disk I/O when running. Has Microsoft Digital Signature. Unsure action of file so leaving it alone, but may terminate in Taskmgr.exe. Without deleting, one could also restrict access or move the file, though I think that would require trusted installer access rather than adminstrative.
  John V  
Appears to be Microsoft collecting info for themselves. Locks even fast machines at 100% disk use for hours.
I can't tell you exactly what it does, but often times my computer will grind to a halt, I go into task manager, and low and behold it's this same process eating 100% of my disc space for some reason. I just disabled it and it doesn't seem to cause any problems (infact it fixes them), but I'm hesitant to delete it since it IS a microsoft process.

Rating chart

Summary: Average user rating of CompatTelRunner.exe: based on 19 votes with 14 user comments. One user thinks CompatTelRunner.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 5 users think it's neither essential nor dangerous. 3 users suspect danger. 7 users think CompatTelRunner.exe is dangerous and recommend removing it. 6 users don't grade CompatTelRunner.exe ("not sure about it").

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Best practices for resolving CompatTelRunner issues

A clean and tidy computer is the key requirement for avoiding problems with CompatTelRunner. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the CompatTelRunner.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

CompatTelRunner.exe [all]