How can i clear the preview cache?

i cant start the software.
Because i have a error in the preview cache.
how can i clear the cache?

Hello milan,
could you have a look there:
http://helpx.adobe.com/lightroom/kb/optimize-performance-lightroom.html and >>>
http://help.adobe.com/en_US/Lightroom/3.0/Using/WS47E8B7F6-16B7-40db-9B3E-2B7D45DCD418.htm l
Hans-Günter

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