Try these:
1) The Canterbury Tales by Geoffrey Chaucer (you should read it in the original Medieval English if at all possible; get an annotated version that explains the words at the bottom of the page; if you know any French or German, that should help (it really isn't that hard); it is the only way to read it; you can get a modern English version but it is just not the same).
Chaucer's pilgrims on pilgrimage to Canterbury tell tales encompassing all genres of medieval story telling. Reading the whole thing is a little ambitious; read at least: The General Prologue; The Knight's Tale; The Miller's Tale; The Wife of Bath's Tale (the Wife of Bath is one of the greatest characters of English literature), and The Pardoner's Tale.
2) The Nibelungenlied
Medieval Romance of Siegfried, Brunhild, and Attila the Hun.
3) Morte D'Arthur by Sir Thomas Malory
Malory's late medieval version of King Arthur's knights.
4) The Inferno by Dante Alighieri.
Dante's immortal journey through Hell, with the spirit of the Roman poet Virgil as his guide.
5) The Little Flowers of St. Francis (of Assisi) (Called the Fioretti in Italian).
Brother Francis and Bernardino preach to the Wolf, the birds, and restore a church.
6) Chretien De Troyes' Arthurian Tales (earlier than Malory's version; the French version of the stories of Arthur and which Malory is believed to be referring to when he states "the French book saith" throughout the Morte D'Arthur. You should actually read this version first before you read Malory.
I played the "Guild Wars" single player game; it was ok, but you fight using real time strategy, so it isn't a hack and slash game.
I wasn't overly impressed. It was ok. Graphics were pretty good.
This was the "Factions" game which was set in a medieval Asian environment called Cantha.
They have two different Platinum Editions, one Guildwars and Guild Wars Factions, another Guild Wars and Eye of the North, for something like $30-40.00.
Get the one with both Guild Wars and Factions, because Eye of the North is a smaller campaign, and you should probably still be able to buy it on sale somewhere now for $15.00 or so.
It was ok.
I also played on Xbox "Lord of the Rings: Third Age" where they tack on several characters (you play one of them) not found in Tolkien's books.
It was ok; very linear gameplay.
The actor who plays Gandalf in the films narrates the plentiful helpful wizard hints throughout the game with film footage from the films.
You should be able to buy it at a Gamestop Store used for $6-8 dollars.
Again, gameplay is real time, even more so than Guild Wars, you click, and attack, and then take turns with the AI characters on your team. Very slow.
But if you really like Rings, you should give it a try; although I did stop playing it after repeatedly getting massacred by about eight orcs in the Mines of Moria.
Single player only.