are you running in compatibility mode? I had it where i would lag and spin around usually after zoning, used to be super annoying since i would spin 180 degrees and zone out again before i could regain control of my character. I also had an issue where i would crash maybe 30% of the time while zoning. After switching to game to XP compatibility mode i haven't had a single problem. I also used to get the hitching to happen when i played from work, but moving the EQ directory off of the computer and onto a flash drive actually fixed the problem at work.