How do I create and save a DxDiag.txt file?

For games on PC, it's very quick and simple to create a DxDiag.txt file.  These are extremely helpful to our support representatives in diagnosing potential root causes for common PC problems, such as launch crashes, incompatibilities, and graphical/sound defects.  Here's how you do it:

1. From anywhere in Windows, press and hold the Windows key (on the bottom-right of your keyboard, between Ctrl and Alt) and simultaneously press R
2. The Run dialog will appear
3. Type "dxdiag" and press Enter
4. The DirectX Diagnostic Tool will appear, showing all of your system information
5. Click on "Save All Information... " at the bottom of the window
6. Optionally rename the file and then save it to a location of your choice