On Tue, 15 Dec 2015 17:34:37 -0000 (UTC), Oscar wrote:
My grandkid wants a "gaming" computer (and don't want to make the
same mistake again!).

Long ago, I bought a different grandchild a computer, which turned out to
not be able to run Call of Duty games he wanted to play (and Target
wouldn't even take the games back).

So I don't want to make both those mistakes again.

This time, I asked what games he wants to play, and he said he'd like
to play something called "fallout 4" which doesn't apparently work on
his playstation 3 we bought him a few years ago.

What do I need to look for in a Windows laptop that will play such games?

The "Fallout 4" game is available in either Sony PlayStation 4, Microsoft
XBox One, or computer.

Since you'll be buying a new machine regardless, if they already have a
PC/laptop, I'd recommend a gaming console instead of a computer. Preferably
PlayStation 4. Keep the computer for other things.

The reason is that a gaming console will guarantee that the game (for that
gaming console) will work. And it'd take the least effort to setup the game
or any new game.

PC/laptop computer is different. It's basically a general purpose computing
machine. It can do almost anything, but a specialized machine (non
PC/laptop) will do better or much better. It'd take more (and up to
frustating) effort to setup a game, *and* it may not work smoothly or not
work at all. And it would cost considerably more for a gaming computer than
a gaming console, for nowadays games. Considering that tech devices tend to
get obsolete rather quikly.