my girlfriend wants to play a very specific type of game...

...and wants you guys to suggest one!
 
criteria:
 
-PC
-a role playing game, not an mmo, no JRPG
-she wants a  game where you can collect a whole bunch of items (TES-style)
-medievel setting 
 -a whole mess of side-quests (open world maybe?)
 
the gothic series, torchlight, diablo, neverwinter series, baldur's series, icewind dale series, TES series, vampire series, dragon age (series?), divinity series, witcher have been noted. smt else
 
no fable
 
if i get more criteria i'll update the list
 
thanks in advance! =)
 
EDIT: what was suggested till now and noted on our list: fate, sacred(series), mount and blade, arcanum, nehrim(TES: oblivion), dungeon siege(series), risen, venetica, titan quest

Morrowind!^^

Why not just play Oblivion?  Assuming you mean medieval as a setting with swords and stuff.  It's an RPG, mess of side-quests, and it has lots of stuff (TES-Style ;).  

Two Worlds may not be the greatest game ever, but you get to collect a shitload of items in a huge open world.
I have heard the sequel is better but I haven't played it myself.

Torchlight might work.  
 
Also who else read the title and thought "kinky". 

" Torchlight might work.   Also who else read the title and thought "kinky".  "

Dragon Age.

You've listed all the better ones that come to mind, but if she's running out (I know I did), then:
The Sacred games 
The Divinity games

If Gothic is there, so should Risen. I'm sure she'll enjoy it. I would suggest The Witcher, but it lacks "collecting a whole bunch of items". Mount & Blade perhaps? I'm not sure about the last one, though.

If you already own Oblivion, you may wanna check out this total conversion.
 
http://www.nehrim.de/indexEV.html

Has The Witcher been mentioned?

Torchlight

Although you asked for medieval setting I was about to suggest Vampire The Masquerade: Bloodlines, because your girlfriend's gaming taste pretty much makes her my soul sister &I loved that game - but perhaps it's the 'vampire series' you already mentioned?    

Drakensang

" Has The Witcher been mentioned? "

Dungeon Siege games. 

Fallout 2 has all of that with the exception of the medieval setting.  
 
Apart from that I would say Arx Fatalis. It doesn't have much in the way of side quests though, iirc.

i thought this was going to be about Rapelay, sigh, oh well.

Wizardy 8 is a good game, though it's hard as heck and the conclusion to the whole franchise.
Turn-based combat...   

" i thought this was going to be about Rapelay, sigh, oh well. "

RISEN

Torchlight is great fun, I'd go with that.

" Dragon Age. "

Venetica? Don't know much about it but it seems to have some indie charm.

" @nk19 said:

" i thought this was going to be about Rapelay, sigh, oh well. "

Hahahahaha haaahahaha, oh boy I'm so glad that pathetic excuse for a funny joke didn't get old a year ago on Giantbomb. Comedy gold right there, people! Genius! "

Divinity II: The Dragon Knight Saga.
Takes place in a magical world called Rivellon, populated by both intelligent races, such as humans, and less intelligent creatures, such as goblins. Involves a lot of item hunting and there are also plenty of customisation opitions. My girlfriend loves it. I can't deny that it's a good game but I don't really like it as much as she does. I guess I'm not into Dragons and scavenging.

Neverwinter Nights?

" @arab_prince said:

" Has The Witcher been mentioned? "

It mostly never gets mentioned because people can't figure out how to play that game. People find it "too confusing" with all the potion/alchemy stuff, it's sad really since it's a great game :( "

" @valrog: risen is on the list. thank you. witcher...is kinda about collecting stuff is it not? but you're right she's gonna try it, but not now. mount and blade also on the list, although we agree the game looks crazy :D "

Two Worlds 1 and 2

I wouldn't rule out Titan Quest either. That is, if she like Diablo-clones.

" Torchlight might work.   Also who else read the title and thought "kinky".  "

Ultima VII or Ultima Underworld.

Along the same line of the Sacred/Diablo games are the Titan Quest games and the game Loki.

 the gothic series, torchlight, diablo, neverwinter series, baldur's series, icewind dale series, TES series, vampire series, dragon age (series?), divinity series, witcher have been noted. smt else     

I'm sure if you get creative sex would suffice.

" I'm sure if you get creative sex would suffice. "

" @mazik765 said:

" I'm sure if you get creative sex would suffice. "

This lady wishes to role-play in a medieval setting with a whole mess of open-world side-quests, where she gets to collect a bunch of items. I think it's cheaper to just buy her a game =/ "

" Along the same line of the Sacred/Diablo games are the Titan Quest games and the game Loki. "