PC computers can not run MacOS.
PC computers can run Darwin, the version of BSD Unix that sits beneath MacOS X. They cannot, however, run MacOS X programs, use the MacOS X user interface ("Aqua"), run Classic, or run Carbon applications. In short, they will only run specially-compiled BSD programs.
For technical reasons, emulating a RISC processor such as a PowerPC processor on a CISC processor such as an Intel processor is extremely challenging. It would be possible to write a Mac emulator that emulated a PowerPC Mac for a PC, but it would be very difficult, and it would run very slowly. Worse, it would require licensing Apple's Open Firmware, which is protected by copyright law.