Resource Monitor
For Windows 7 and above, you can use the built-in Resource Monitor.
Open Resource Monitor, which can be found
- By searching for resmon.exe in the start menu, or
- As a button on the Performance tab in your Task Manager
From CPU tab, use the search field in the Associated Handles section
When you’ve found the handle, you can identify the process by looking at the Image and/or PID column. You can then close the application if you are able to do that, or just right-click the row and you’ll get the option of killing the process (End Process) right there.