To the OP,
Your hardware (both desktop and laptop) should be able to play the game just fine, so the only thing that is common in both that may be causing the problem is your Win XP 64-bit OS.
If it is any help, you did mention that you plan on trying out Windows 7. I have Windows 7 Home Premium 64-bit as my OS on my laptop and it runs KBAP just fine.
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