The Elder Scrolls 5: Skyrim

[DAMN iNATOR]

Originally Posted by Extreme Angle Use the invisibility to sneak in, use charm to stop them worrying, feed when asleep, then go do the vampire cure quest.

That's the long (and somewhat messy/troublesome) way of doing it (get a black soul gem, kill someone (preferably in their home at night without being spotted as you'll be attacked by any guards or citizens on sight!) to fill the bsg, then take it back, and wait around until like 3AM in game and go to a designated island and stand where the guy says until he recites this incantation that cures you.

The simple way: Find plenty of Cure Disease Potions in the game (they are in abundant supply in dungeons, alchemists shops, homes, etc.). Take one and it cures all diseases, even Sanguine Vampiris.

On a side note, I think in Morrowind and Oblivion the common "scientific" name was Porphyric Hemophilia or some weird phrasing to that effect.