Nowaday, most PC support automaticlly power on without pressing power button when 220v is on.Please check your BIOS setup item.Usally this item named "Power on after power fail", and just setting this feature as on. And do full booting to make this feature function.
Secondary, if you want to press power button to power down the system in windows.you must make sure your PC's BIOS is ACPI complaint.If yes, you could turn on this feature at Power option in control panal , and select Adance.Then you would see what your want.
Basiclly, you would get all your want if your PC BIOS supports.
Hope to help you.