How to stop KDE-Time Schedule to boot with Linux?

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http://askubuntu.com – I've tried out KDE Time Schedule once, but it always keeps saying, "The component for KDE Time Schedule cannot be generated!" (or something like that, I use kubuntu in German and translated the error message into English for you!) Now, since I have first started this KDE Time Schedule, it keeps starting with kubuntu. (And always telling me the error message above on start-up.) Question 1: How can I stop a programme from starting with kubuntu? Question 2: How can I make KDE Time Schedule work? I am using kubuntu 11.10. Thank you for your answers in advance, Thomas (HowTos)