I never tried to tweak windows for this purpose, as it feels wrong to me, but i have tried others. At first i was sceptical too, but linux daemon based os-es with locked cpu parameters and other optimizations do sound better. Blacker background and more depth to the sound. This is no placebo for me. The effect is of the same magnitude as difference between two different Sabre based dacs i had to test. It's there. Latelly been using Raspberry Pi2 with Volumio or Archphile, which to date is best computerized source i have heard.