This is really making me angry. Im on the main quest "Aid for Bruma" and i try to talk to Hal Lurez, who is in that tunnel thing (I already gave her the cure for the count) Now she just says "Please wait here, ill let the count know your looking for him". I broke in and talked to the count but he says "Go Away" Now i can not finish the story! HELP!!

Is it just me, or is that quest full of bugs?

I tried to get the cure for my character, and when I got to the point where the witch was going to make the potion for me, she just disappeared and never came back... So, I restarted my whole game.

The help of Skingrad is not necessary to complete the aid for bruma quest, in fact it is completely useless...

The cure vampire quest is full of known bugs (see topics related to the quest)

There are several known bugs for this (and it has nothing to do with the Aid for Bruma quest). Here is a walkthrough with several tips for dealing with the bugs:

http://www.uesp.net/wiki/Oblivion:Cure_Vampirism