Maybe these instructions will help! http://www.windowsdevcenter.com/pub/a/windows/2005/01/18/PearPC.html Good luck!
PearPC is a PowerPC emulator capable of running many PowerPC operating systems. There is nothing to fear in using it to emulate MacOS X on your system. I've never tried it with a Mac OS, but I'm sure the link I provided above will give you step by step instructions in using it. Good Luck!
assuming you want to dual boot not emulate click to download torrent tiger-x86.tar.bz2 image of mac os x also known as deadmoos image and this tutorial should fill you in the the rest of the way you can also search a little bit