i started the conjurtion ritual quest in the college of winterhold, im to the point where u have to conjure and subdue the unbound dremora but when i was fighting him for the second time he just died... he didnt dissapear, he is laying on the ground dead. it wont let me resummon him or do anything to him,,, any ideas?

That script for this quest is a bit dodgy.
You may need to load an earlier save.

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I will move this now.

that the only thing. i kept playing not thinking of that n got quite a bit done.... if it s the only way i will but i dont wana go back

Fraid so, but completing it is worth it.
Details on the bugs in this can be found on the http://www.uesp.net/wiki/Skyrim:Conjuration_Ritual_Spell.

ok. thanks. its gunna hurt tho i dot like 4 dragon priest masks and 30 smithing lvls..........