Ok, I changed the games resolution to the lowest one (By accident while trying to find a faster resolution for fullscreen) and now I can't get it to work, i always get the Error 'can not set 258 x 144 x 16 in any windowed mode'

So I want to know, is there a way to change the reolution of the game without having to remove and reinstall?

EDIT: Oh yeah, I'm using TSF. I really want to get back on, I found a fun server