Just delete it (the eqclient.ini file) or move it to the desktop. Then everytime you log in, it'll create a fresh one for you. Once you have everything the way you want, just log back out and save the file somewhere else so when it happens again, you can just replace it with the backup with all your saved settings.
I did notice that if you make changes to any of the option in the Options menu, then it's a good idea to log out by camping. If you /quit, you might corrupt your files again.
Works everytime for me so far.
