Application damaged or incomplete, some document also deleated
macbook 10.6.8 snow leopard, when i started its takes very long time around 20 minute and when it start some of files, picture, documents, movies and data are deleted automatically. And some of preinstalled Application like ichat, address book etc not opning its showing damaged or incomplete. how i fix these problem.....is there any posibility to get back my all automaticaly deleted data/file/document/pics please help i don't have any backup. I can't understand what happen and what to do now.....please help me
MacBook, Mac OS X (10.6.8)