try to start kopete in konsole, and look at the output in the konsole window when kopete crashes
perhaps it can give us any clues why the application crashes
Help mee om KDE 3.5.5 in het Nederlands te vertalen
And try to get a backtrace. Crashes should be reported at http://bugs.kde.org , but only if the backtrace looks detailed enough and if you can exactly specify the steps you've done to reproduce.