Perhaps Adrianna gave you the key instead of the ring?
The key opens the vault in the Lich's study.
The vampire ring is only good if you have run the game patch. Without the patch, it will just cause your game to crash. The ring is pretty good - has regeneration and 3 resistances (I forget which) at 100%. Someone will have to provide me with the code for me to hack you one!
Wyv