I know there already are at least ten other threads regarding this, but there seems to be no actual solution. I have been 'living with it' for two years now, and am at the end of my tethers. Two years ago, for reasons I forget, I deleted Quicktime. I can't remember which version anymore. Anyway, I have tried to reinstall Quicktime, 7 or X, again and again, but either get the message "already installed", or the installed Quicktime 7 simply crashes. It wasn't a problem at first, as I never used the QT player, who does?, but it IS a problem because I can't run iMovie or even iTunes without Quicktime (that is to say iTunes crashes when entering Store) What can I do? I no longer have the Boot DVD, or OSX DVD, so I can't reinstall Quicktime from there. Are there ANY other ways? I read somewhere you can delete QT receipts, in the Receipts folder, but U cannot even find that. Are there any solutions? I'm willing to try experimental radical approaches I run MacBook Pro OSX 10.6.8.