For Windows 7, 8 and 10 you can use the built-in Resource Monitor for this.
- 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
- Open the CPU tab and use the search field in the Associated Handles section
- Pointed at by blue arrow in screen shot below
In case it's not obvious, 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 right there. Easy peasy!