Teknus... Here's the issue. For starters, I understand software licensing issues may not be interpreted the same in all countries (although they are still applicable). I also understand that everyone is not familiar with what software licensing is. It is technically possible to install OS X on a PC (as you have seen on your friends computer). However, Apple has designed OS X to only work on Macs. In order to get OS X to work on a PC, it must be modified ("hacked"). As these forums are owned by Apple, we are not permitted to provide you with instructions on how to hack their OS.
Having said that, I have used OS X on PCs. It is not a pleasant experience at all. The experience is actually poor enough on a PC that I would not even use it... opting for Windows or Linux instead. You're simply sacrificing too much of the true OS X experience when you try to run it on standard PC hardware. If you want to try a different operating system, give Linux a try. There are many free versions out there and they will run on just about any PC. The forums are also very helpful. Linux is much more similar to OS X than Windows.
I understand that Macs are expensive and that you would like to use OS X on a PC. The simple fact is that using it on a PC would not be the same as using it on a Mac.