In fact when I installed Windows Xp pro, I install the Diablo II. All is fine. But when I run Game.exe or Diablo II.exe, the OS gave me a alert that said this is an illegal program or the program has been damaged. I also uninstalled the Diablo II and run setup again. But the same problem occured finally. Is there any problem of my hardware or I must get some cracks or some service pack for both windows XP and Diablo II???