Well, that's not entirely the name of the quest, but its only available through the VL quest line, where you go turn an NPC into a vampire. Well, I did that, everything went fine, turned it in, got the credit. Did a couple more quests, got that quest again.... But it was the SAME NPC again.... Is there any to cancel the quest? I goofed and saved after that, so I can't go back and see if he gives me a different NPC...

Only way to get a dif quest is to reload a save before you completed the quest before you got the quest to turn the same NPC.

(Game randomly selects the next quest for you when you complete a quest)