By default, Windows shows program names for icons in white with a minimal black shadow under the letters, but this is not the best combination if you use a too light background. In this case, Press [Win+R] to launch the Run window, then type SystemPropertiesPerformance and press OK.
On the Visual Effects tab, select Custom, then find the option Cast Shadow on Desktop Icon Labels in the list and uncheck it. The captions now appear without a shadow but in black. If you prefer this version, all you have to do is press OK. Later, of course, there is always the option of returning to the original state with white letters and shadow by moving the tick back.