I know this has been mentioned umpteen times, but I canne find the reference to it on searching, so please humour me?
I have completed the Companions questline, and finally managed to get Vilkas to start the Purity quest in order to cure him of lycanthropy. However ... he just goes back to where he was and it says the quest is done (though it is not).
Any clue how I can get this fixed? I'm on a PC, so I can use console commands if necessary.
I would ideally like to actually do the quest, as opposed to just auto-cure the hubster and no doubt Farkas too.
Many thanks.

