What I tried to do.
I've had similiar glitch with the guy from the Companions (Farkas maybe?) when he followed me around and talked to me constantly. That was because of his guard faction, but that's not the case. I used a 'disable' on that dude, so I wanted to do the same thing with Peryite. It turns out that there is no such npc at all, so it's impossible to target him.
Then i tried to reset the Peryite's quest via console (da13 and da13intro). It worked for the most part - Peryite stopped chasing me, but (1) qust can't be redone, and (2) I can't select ANY dialogue option in the game. So basically I can talk to people, but I can't respond to them - gialogue lines can be selected, but it just grays out and conversation won't progress any further, the only way is to Tab out.
I revisited my old savegames and found one save when that thing starts, but that's weird, because before everything was fine. I also tried to disable all my mods, but it didn't get me anywhere - bugged conversation remains.
So how could this be - suddenly all savegames to the certain point become bugged even though they were just fine? The only reason I see are mods, but why then disabling all of them didn't help?
Any advice?
Losing 50 levels of progress because of one filthy daedra is not good. At all.
[img]http://img851.imageshack.us/img851/391/screenshot4rl.jpg[/img]
P.S.
Sorry for such a lenghty explanation, I was just frustrated trying to fix my game...