I was about to say if iTunes is freezing, you must be using Windows but that's not the case. Not sure why this is. Try reinstalling.
went into user library and erased all prefs, saved state etc. erased my iTunes library files, reinstalled iTunes,
it worked for a day to download perhaps 20 songs. but froze on playing them. now freezes on just trying to get to the store, importing even one music track etc. Going back and erasing everything gets iTunes open with a blank library, but trying to do anything freezes it up. just changing from music to movies (which are blank) freezes it up.
updating itunes had no effect. restarting computer had no effect. repairing permissions no effect.