GSpot.

GSpot has no install.
Though I got it to crash, & crashed (kind of) hard.
Windows asked me what to do, & I said something like, wait on it.

During this time, most other apps that I had running, could not be given focus. Though the X (close) box (on GSpot) still did work (suprisingly), & once I realized that, I then was able to change my decision from wait, to close/check for solution - without having to open Task Manager.