Question: There's an invisible window of some application on my desktop and the only thing detectable about it is its borders as seen in the image below. The window or its edges are not clickable.

[![Desktop with invisible window borders visible](https://i.stack.imgur.com/apYyf.png)](https://i.stack.imgur.com/apYyf.png)

I'm guessing this could be some malware so I need to identify which application is drawing that window. So far, I've gone through the list of running processes in Task Manager to see if something looks suspicious and have scanned the PC with Malwarebytes Anti-Malware to no avail. I also tried using Process Explorer's drag over window tool and it just detects explorer.exe. Could this be a bug in explorer? I'm running Windows 10.

Answer: 
Try using this program from NirSoft: <http://www.nirsoft.net/utils/winlister.html>

You will be amazed at how many windows, both visible and hidden, are actually created by the running software on your computer. That WinLister app will supposedly allow you to identify, and kill, any window.
Sysinternal's Process Explorer (procexp) can find the process for any window.

Drag the "target" icon to the window and it'll highlight the process in the list.

[![enter image description here](https://i.stack.imgur.com/bxkRT.png)](https://i.stack.imgur.com/bxkRT.png)