Stuck in a mage guild quest!!!

[cell_]

I'm stuck in a the Mage guild quest: Information at price... I killed all the Vampire and I accidently took the vampire dust for mixing potions :x and I can't finish the quest 'cos the Vampire hunters don't leave the town... I already tried to get Vampire dust from other locations... when I speak to the caracter the topic about vampire dust never come! Help... and I did overwrite my previous save

[The Guardian]

load one of your most recent saves, this should also go into this (http://www.achieve360points.com/forums/viewforum.php?f=48) forum. You would get more responders.