you can't their are NPC's (non-player controlled) that are vampires but you can't be one.
another answer:
Actually there is kinda a way. make your character have the pale white skin, and if you want to have black hair. then just act like a vampire. my character is a vampire so, it isn't impossible.
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you go to the darkova wood's and enter the vampire queens castle and become a vampire
to become a vampire you have to stay the nite at the grave yard .......................
no, you can only become a vampire if you have the sims 2 Nightlife for the PC
Simply keep attacking him and when he is on his last legs, use the completed stake on him.