Yes, it's part of the Companions questline. Continue doing missions for them, eventually Kodlak will talk to you about a cure, it's pretty self explanatory from there.
You cant,you must do the companions quest in order to become a werewolf. Its the only way,however there is a way to become an alpha werewolf,which instead of being black, you are white and feared by all other werewolves.
Go to Whiterun and join the Companions. The offer of becoming a Werewolf is part of their quest line.
Get Curre
you really cant once you pick werewolf of vampire you stay that sry :(
To fix the no quest items bug in Skyrim you have to download the most recent patch.
Join the Companions in Whiterun and do a few of their quests. Probably about the fifth quest you will have access to the ability.
The end of the main quest features the king dragon Alduin being defeated by the Dragonborn, although the game can still continue after.
In the beginning of the game, you'll come across a woman named 'Aela the Huntress'. Speak to her about becoming a companion. Along the quest line for the Companions, you'll hit a quest called 'The Silver Hand'. During this quest, you are given the option to become a werewolf.
I got the quest but i didn't do it. Now i don't see the quest
It is part of the main quest. Delphine will give you this mission.
Go get cured or drink from someone. Make sure your vampire level is the lowest, (by drinking) then go to an Inn and ask the keeper about the rumours. You should have a quest now related to vampires and undead creatures. Complete that, and by the end of it you will be cured.
CalIxto