btw all settings for all apps are in home/user/.kde/share/config - you might try to rename the konqueror settings, for example to konquerorrc.bak - that way, konqi will regenerate its configuration. but as bram said, its very likely you're mime settings are broken somewhere, dunno what config file that would be...
reinstalling is generally useless under linux, as problems can only be in your settings (unless your disk crashed).