Question Friend wants to build a gaming pc for $1400-1500.

He intends to use it to do just any kind of gaming. Triple AAA to indie. He has a monitor. He doesn't have windows and he would want a legit version. He doesn't have any parts yet and he prefers Intel. I7 at least.
What does he intend to use the PC for? Does he have a monitor? Transferrable copy of Windows? What country is he in? Does he have any parts already that he could use in a new PC? Any Intel/AMD preference?