I was trying to get into underdark, but I've given up on Cpt. Belgold as I have plenty of other quests. As a friend of mine explained it's still early lvl 70 for me and to continue the grind and sooner or later another link will open. Thanks to all for your efforts.
I finnaly licked it. I also tried to no avail to fix my character. I finally gave up and started a new character and rigorously held myself to the story. In other words I held myself to Sgt. Knox orders, and if he said go to such and such I would stay there doing quests until I was sent back to the Sgt. (You always get…