You can run windows on Mac then why can't you run Mac OS-X on PC? Is it the intel chips for PC not designed for Mac OS-X?

The Intel Macs use EFI, not BIOS. They also only have drivers for certain bits of hardware (the hardware that shows up in shipping configurations of Macs). I think there's a few other restrictions as well; google it.

You can, via a hacked OSX which emulates EFI. It is against the Apple license agreement to do so however.

dont you think that if apple allows users to install their OS on PC then it will turn the market/industry up-side-down. There has to be something more than that !?!