few days back one my colleague called me that iTunes is continuously crashing. when i visited him error log was showing coreaudiotoolbox.dll component failed to start and was causing to crash iTunes. normally this component is used by QuickTime player. in earlier versions of iTunes this error could be resolved by installing latest QuickTime player. but in this latest version they changed the way how this component works.
iTunes crashes with coreaudiotoolbox.dll
if you are running windows 7 and facing this app crash , the only solution that may work is windows update, the computer i have seen was running windows 7 without service pack 1. i just ran windows update & installed service pack 1. after restart iTunes opened without any problem.
as you can see in following video