I remember playing a movie type game about a boy trying to escape this castle.

I'm sure its called Halo, (its a one worded game), but it appears (Halo) is a machine robot game of some sort.

It starts by introducing these people carring a baby wrapped up, then they come to some sort of pot hole where they look at the baby, then it is revealed that it has pixi ears, (this was informed in a way that they had a deformed or wrong child?) they put it in the pot hole and left him. Years later he's a teenager, trapped in a castle, trying to free himself.

Also i remember having to control the boy to free a girl, spirit/ghost locked up in a cage high in the air, in the castle. but evil spirits take her away, she so scared of them too.

Any ideas guys?????

The game you're looking for is ICO. It's not a pc game, but a ps2 game.

http://en.wikipedia.org/wiki/Ico

It's a beautiful game, well worth the play. A sequel of sorts (altho it doesnt have too much in common with ICO in terms of story) is Shadow of the Colossus, also for ps2