In the next release, removing Blood Types will be an ini feature; Dante's suggestion should work fine for now
Woodlock, some people have reported this occuring, but I don't know why it would. Try opening the console, and typing : Set ZCDMVampirismControlQuest01.InitialSetUp to 1
Seventh Son, can you give me a little more information, please? Have you ever been a Vampire before, any Vampire Mods? Let me know what answer this gives : Show ZCDMVampirismControlQuest01.ContinueAsNormal
Also, make sure you have the right PH: start a new character (for testing), and type 'Player.AddSpell 3db3d' into the Console. From there, wait three days (I recommend using 'Set GameDay to GameDay + 1' for speed), and see if that does it.
Looking at the Scripts, I wonder if something in the Start Up Scripts is stopping the checks for the main system (and thus stopping infection + Amulet addition)