Ftl, you would have thought Bethesda would release a simple update for this. I mean how long would it take them to fix a small bug like this? Thanks man! I'll just have to wait for Skyrim then.
Only option is to find an old Oblivion disk to rent or buy (with no other dlc and you didn't do shivering/kotn) do the related quest then pop the goty disk in... or just plainly don't get vampirism.