xp sp-2, on gigabyte g31 mobo, 1 gig kingston ram, e7200 cpu, with bios settings per cics.  asus essence stx soundcard, powered by my 12v/5v linear power supply (recipe from John Swenson's fit-pc psu design on audio asylum), feeding aq digital cable to cary xciter dac.  0.9y-7 current settings: ks-adaptive, unattended, q1=4, Q2-5 all 0.  player priority nothing, thread priority realtime, services suspended, have not tried any upsampling, or any other modes.