Applications keep "Quitting Unexpectedly"

hi there, question, beginning little miffed mbp!
started couple of months ago, randomly getting crash reports coming saying remote desktop had unexpectedly quit. followed thread on mr , managed solve problem, since have been having random applications "unexpectedly quit" including itunes, no matter how many times tried open, kept closing on me. simple re-boot rectified problem moves between safari, itunes, ical, , various others, please someone!!!!!

jim

13" macbook pro 2.4ghz intel core 2 duo, 8 gb mhz ddr3 os x 10.7.2 (lion)

 

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