I've been playing for a few hours and goto a point where it will not pass a certain level.

It's where your supposed to be evacuating and there's a big ship on the right of you. Well once i get inside the designated area everyone dissappears, there are guns still firing, even shooting down the alien ship makes no difference.

What's wrong with it?

And if anyone asks me to re-install the game, can you at least tell me where the save game files are. I'm on windows 7 64 bit if that makes any difference