Graphics issue and getting booted to desktop

[JazzineCleric]

I have an issue where I go from running normally to suddenly floating like a ghost. I'll be running and casting spells normally but then I will set down to med and it will appear as though I am still sitting even though I am moving around and killings things, and then the mobs will look as though they are stuck. I don't have any mods or anything to ui. And then a little bit ago, I was running through Qeynos Hills and suddenly got booted to desktop. Any ideas? I have scanned all the EQ folders and nothing appears to be corrupted. I am using Vista service pack 2.