A diagnosis of Hep C does not in itself cause you to be more at risk of getting H1N1 or of having higher risk of complications from the virus. There is no contraindication for you to get the vaccine, but since you are taking anti-virals, you may have a decreased immune response to the vaccine--causing you to not build up as much immunity as someone else.
So, simply put, you should consider getting the vaccine to give you as much immunity as possible.

