Hello again
The problem I had was solved by moving the game to my linux partition. I was hoping that I could play this game directly from a windows partition (I'm still interested in how could I do that). Anyway, I moved the game and everything was allright, I entered the mainscreen, but when I try to start a new game, load or change the options, I'm kicked out to console with the following error

./nwn: line 12: 6391 Trace/breakpoint trap ./nwmain $@
My pc is an athlon 1800+, Maya Radeon 9000Pro (with the drivers from Schneider, installed exactly as you described on this forum; but my driver doesn't seem to work very well with XFree86 4.3.0 on my suse 8.2, I mean I have zounds of FPS in Gears, but when I try to play a 3D game, I'm kicked and my screen remains in a "virtual resolution" even if I deselected that option)
thank you again;