Hey guys, got back into skyrim in anticipation of Dawnguard and decided I was through being a werewolf and wanted to become a vampire for the upcoming dlc!

But I've ran into trouble on the whole cure front! As Vilkas won't give me his purity quest, and I've lost count the amount of quests I've done for him! Then I read online about a glitch if you do Vilkas' before Farkas' but the trouble is that I've made Farkas a blade! So I can't get quests from him anymore!

Any ideas?

P.S Im on the Xbox so console commands etc are not an option

Take Farkas as a follower walk back to http://www.uesp.net/wiki/Skyrim:Jorrvaskr fire him and before he leaves ask him about work. You can also try taking a job from Aela if Vikas isn't giving up the cure job.

P.S You don't need to cure your lycanthropy for Dawnguard, if you choose to become a Vampire Lord you'll be cured automatically.