I'm currently looking for an emulation program that would allow me to open and run osx app.s and programs on a windows xp based system.
if not is there a unix/linux/lindows program that may do the same?

I went to this site to check it out, sadly I'm a little confused as to what to download.... and do I need to purchase osx in order for this to work?
(thank you Tux)

I never used the program, but quickly looking over the site the answer is you would have to own a copy of OSX. This is usually how most emulators work, as they only emulate the hardware, not the software. It may be possible to use the Darwin OS to accomplish some of what your wanting, though I am not certain as I have not done so.