The Legacy of Kain series. All of them are on pc im sure and will all run fine due to them being old games.

Blood Omen: Legacy of Kain
Legacy of Kain: Soul Reaver
Legacy of Kain: Soul Reaver 2
Blood Omen 2: Legacy of Kain
Legacy of Kain: Defiance

in that order story-wise

The most engaging games ive played on psp story wise and MGS peace walker and Crisis Core, but im sure you have played them.

Trade your xbox for a PS3 and get MGS4 and you'll cry over the ending.

The manga Berserk, although slow, is very powerful when it hits the climax of the story.

Any book by Dan Brown (particularly angels and demons if you haven't seen the movie) is awesome stuff.

And if you can track down the original (as in uncut version) copy of the Count of Monte Cristo by Alexander Dumas not only will it take years to read but it will indeed tell you one hell of a story.