Symptom
When you start up your computer an alert box with one of these error messages appears:
"The Sound Manager extension has expired."
"QuickTime MPEG Extension has expired. See 'http://www.apple.com/quicktime' for a newer version.'
"QuickTime installation failed because this beta version has expired. See 'http://www.apple.com/quicktime' for a newer version."
Solution
The version of QuickTime 5 Public Preview installed on your computer has expired. Download and install the latest version of QuickTime 5 from
http://www.apple.com/quicktime/ .
If you continue to see these alert boxes after installing the latest version of QuickTime 5, follow the instructions in article 31309: "
QuickTime: How to Remove QuickTime 5 Public Preview" and then reinstall the latest version of QuickTime 5.