I think your best bet would be to use a dual boot system, OSX and XP/Vista.

However, I am not sure that Boot Camp for OSX would work with a non-Apple computer, as the Windows drivers that the Boot Camp Assistant creates are specific to the Apple hardware. However, it certainly could still work. I think the biggest obstacle would be getting OSX to run in the first place.

FYI, this is a borderline violation of the policies of this forum, as you are talking about using cracked copies of the OSX software, or cracking your own copy. However, I believe that the license to OSX ties it to Apple products specifically, so porting it to another system may be considered a violation of said license.