Can I get further details on "Application has crashed" message

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http://askubuntu.com – More often than not, on booting to Kubuntu 12.04.01, I get a pop-up message "An application has crashed, now or in the past". I dismiss the message and everything seems fine. Occasionally when booting recently to Windows XP as administrator (though not as regular user) I have had an equally non-informative message "Your system has recovered from a serious error". Should I be worried; if so, how do I find out which application and fix the problem? (HowTos)