你 can't actually get Kingdom Hearts/Kingdom Hearts II for other than PS游戏机 2, but 你 can get a program for your PC called "pcsx2" 或者 other similar programs, and with a little work and a gamepad for your PC 你 can play Playstation1&2 games on it! 你 can download the program here;
link Here's the official English guide to using it;
link 你 can get help from this forum;
link The gamepads cost quite a bit, so if 你 want 你 can program your keyboard to work like one, but it's quite difficult to do and difficult to play with.
A new game called "Kingdom Hearts: Birth 由 Sleep" is coming out on PSP, so if 你 don't want to buy a PS2 或者 go through the PC-to-PS2-way, 你 can just wait for that I guess.
I hope this helps! :]