Windows Vista to Windows 8 seem like they weren't meant to play H-games. I've had H-Games work for my that work for my Xp, but will not work on my Vista or Win 8 PCs. EX: Aneimo 2nd Stage/2H and Dokidoki Oyako Ressun.
My advice, if it doesn't work on Win7, try to find a PC that has Vista or Xp...