The only error I've ever had with Vindictus is it lagging out or freezing during a cutscene with host_timescale on and the client crashing. I've had no problems whatsoever with just running a console and Nico's VinPub. I know you said it's not your computer but in all honesty that's the only thing I think that could be causing it if you say you reinstalled it and it still keep happening.
Did you try running the client without anything injected?
Is your graphics card up to date with the latest drivers?