I'm not on Linux atm so YMMV! In your home folder there should be a .kde folder, in there are all the settings for your user account for KDE. Have a dig around there (probably in .kde/share) for Konqueror settings. There should be a file for Konqueror and in there a setting to change from True to False.
Sorry to be so vague, the joy of Windows
, I'll see about verifying later.