When I say any, I mean any. I will list the quest that I cannot complete.

"Onmunds Request"
I can't talk to the guy at the end to finish the quest

"Return the book to Urag Gro-Shub"
again can't talk to the guy to finish the quest

"cleanse the focal points for magical energies around the college"
I can see were to go but can't do anything to cleanse the college

"J"Zargo's Experiment"
the game will not let me talk to the kid to complete quest

"The Staff of Magnus"
I got the staff and when I arived at college three of the archmages were on the bridge,including Toldir, wanting to fighting someone who was not there. I cannot step foot on the college ground anymore because there is a force field blocking me. All I need to do is talk to Toldir to finish, but the buggy game will not let me.

Is this a common problem or am I all alone. I got to many hours into the game to just start over. I only have a few save so I cannot just loose a few hours of game play. I play on a 360 should anyone want to know.

is there anything I can do to finish the quest, expecally thespeciallyof magnus" quest because I feel that is part of the main storyline.

any help really would be appreciated