Ie / Firefox Won't Start After Update


I have a imac G3/400MHz with Mac OS 10.3.9
just after the update og QuickTime and another security pack the Internet Explorer 5.2.3 and Firefox get troubles. IE won't start; Firefox starts but will stop sometimes?
I've installed os x from cd and let install the automatic update-packages up to 10.3.9
Is there a little faulty file somewhere which I have to replace/delete?
Thanks for assistance/help


The Late: SuperMacMod
For Firefox, delete the Preference file - 'org.mozilla.firefox.plist'

located in user>library>preferences

and the Caches located in user>library>application support>firefox>profiles>default>Cache