xf86config problem

[Jennifer]

Hi, I am newly getting to know Debian and try to make Debian working on my PC.   When I finished installation from the CD set (7 of them) of Debian 3.0 Woody. I found the monitor display quite blur, not clear. So I did xf86config as some people told me.   But when I finished all the process of xf86config. It asked me "whether I want to write to /etc/X11/XF86Config, ". I typed "y". then it told me that " Failed to open file name for writing /etc/X11/XF86Config".    I used command "ls -al /etc/X11" I found there is a file called" XF86Config-4", rather than " XF86Config". In this case, what should I do?   Your any advice always be highly appreciated.   Jennifer Z