Found this so give it a try, hope it works: BEFORE talking to Harkon, open the console with ` (the key to the left of '1') and enter the following console commands... setstage DLC1VQ02 40followed by... setstage DLC1VQ02 180 Talk to Harkon again. He will say that you have forsaken his gift, but will offer it to you again. If you accept it now, you should receive the Vampire Lord power without dying from his bite. Console Players (360/PS3) Go behind a table before getting bitten. He won't reach you in time if done correctly, and the screen should fade to black after a short period of time. Following this, everything should continue normally.