Floating & Glitchy graphic problems with Character

[Malaiit]

Hey all,

I tried searching for this but did not find anything on it so posting. I just got a new computer at first there was a lot of zones I could not get in because I would freez up right away and computer would lock up...field of bone being one of them. Found out this was because I had dual core so downloaded cpu affinity and that took care of that. Now I am having another problem though. When I log in it will work fine for a while but after a bit my graphics glitch or something and now my character is jerky...seems to move really fast and the graphics don't even show him running. I can still play sort of but I run into or off of stuff because so glitchy. Anyone else had this problem and /or knows how to fix it?