How do you get a PC system on a mac?
Assuming you are asking how to get Microsoft Windows installed on your "mac", you could use a VM like Parallels, Fusion, VirtualBox or you could use Boot Camp Assistant.
You are in the Macbook Pro forum and your profile says you have a Mac Pro. You should ask in the Mac Pro forum here: https://discussions.apple.com/community/desktop_computers/mac_pro
Or, if you want to use Boot Camp, ask in the Boot Camp forum here: https://discussions.apple.com/community/windows_software/boot_camp
If u wish to install windows on mac . You do either of following :
1) If u wish to run it concurrently i.e at same time while u r using Mac OS , use some virtualization software like parallels , virtual box - oracles virtual box is free
2) If u want a clean seperate install .i.e boot into windows - use mac boot camp