To Become A Vampire Kill A Random Vampire Then Activate On It's Corpse Again And Again And Again And So On. Untill You Get An effect That Restores Your Fatigue Then Do Not Use A Shrine Or Any thing That Cures You! Then After Three Day You'll Become A Vampire.
There are some vampires during the main story line (If you do the Azura Quest) there are also some beneth the imperial city, also there is a quest in te imperial city and during that quest you kill alot of vampires in a cave just outside the imperial city.
To Become A Vampire Kill A Random Vampire Then Activate On It's Corpse Again And Again And Again And So On. Untill You Get An effect That Restores Your Fatigue Then Do Not Use A Shrine Or Any thing That Cures You! Then After Three Day You'll Become A Vampire.
There are some vampires during the main story line (If you do the Azura Quest) there are also some beneth the imperial city, also there is a quest in te imperial city and during that quest you kill alot of vampires in a cave just outside the imperial city.
Some caves and castles throughout the Oblivion world also have vampires in them. They infect you pretty easily, you just have to get attacked by one or two.