Happhauge makes a usb tuner that is not too fincky as to what system it runs on. But it helps to have some horsepower under the hood.
As for playing games on your laptop you're not clear about how you want to play a game. If you want to remote in to your game machine I'm not sure. The gamers here can answer that. But the games you can get for a game console can be bought for a pc as well.