As Xzien says. try to give more details.
How did you get infected?
What platform and what alliance are you on?
Are you allready inside the instance, or are you outside, not understanding how to get in.
For example. IF you have trouble getting inside the isntance and are in the aldmeri dominion. I know there is a bug there where the questicon is placed on the other side of the hill. Reality is that you have to interact with the vampire shrine where you got bitten. In that case it isn't a person you have to talk to but you simply interact with the shrine.