CompatTelRunner.exe and 100% SSD utilization

This happened to me on Friday.  My system slowed way down and got very laggy.  Check Task Manager and Resource Monitor.  My C: SSD was at 100% utilization.

The culprit, compatTelRunner.exe.  This is apparently something that was used for Win7 compatibility checking for Win10.

I’ve got Win10 and this wasn’t an upgrade.

Anyway, you can disable this via task scheduler.

1. Click Start, then type task scheduler and press Enter.
2. On the Task Scheduler window, go to Task Scheduler Library\Microsoft\Windows\Application Experience
3. In Application Experience, find Microsoft Compatibility Appraiser.
4. Right-click Microsoft Compatibility Appraiser and select Disable.
5. Kill any comptelrunner.exe tasks running and your system should become usable again.
   1. Alternatively, just restart your computer