You need to reinstall the phones OS, to do this you will need a computer with the Blackberry desktop software installed.
Below is a link to a site that has detailed instructions on how to do it, its a bit involved but take it step by step and it will work (I have done this at work quite a few times)
http://supportforums.blackberry.com/t5/BlackBerry-Device-Software/How-To-Reload-Your-Operating-System/td-p/228990
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