I love Dear Esther.
It's a love it or hate it experience, but I thoroughly enjoyed piecing together the fragmented narration and working out the story, and what exactly happened to Esther and the narrator. And, of course, exploring the beautiful island.
And, oh my word, THE CAVES! If you play Dear Esther, you won't forget the caves from the third chapter in a hurry.
It played very smoothly on my Win 7 desktop. If your laptop meets the requirements Marian has listed, you should be fine.