hello for some strange reason i cant open mozilla the following error appear

ERROR: The browser does not exist. Please reconfigure,
An error occurred while loading or saving configuration information for gnome-default-applications-properties. Some of your configuration settings may not work properly.

I was using just last night everythink work find, now i am online by using knoqueror to get on line. i am using kde on fc2 paxmaster $ mozilla -v
Mozilla 1.7.3, Copyright (c) 2003-2004 mozilla.org, build 2004092213

anybody has some ideas

Copy your ~/.mozilla folder to somewhere safe. Then delete ~/.mozilla and start mozilla again. If that does not work reinstall and see what happens.

Reminder, backup your bookmarks.html file which is in your ~/.mozilla folder before deleteing anything.