I believe this is the first book in the Alex Van Helsing series.
Alex has been sent to yet another boarding school after an incident at the last one. As he's walking through the woods one night (yeah, he breaks the rules sometimes), he hears a scream. He finds a dead body and what appears to be a vampire. Not sure how, he stakes her and watches as she turns to dust. Convinced he was hallucinating, he returns to school and what he hopes is his sanity.
No such luck. Alex starts to wonder if the stories about Van Helsing are true. And if there really are vampires, is he destined to fight them? His friends are kidnapped and he knows he has no choice in the matter. He must charge into the lair of the vampires to save his friends.
An interesting premise and story. The story does waiver a little, but the action is solid and pretty believable. No romance here, just vampire hunting and plenty of it!