Error 1920 or 1921 when installing iTunes 5 for Windows

When you install iTunes 5 for Windows, one of the following errors may appear near the end of the installation process that says:

Error 1920. Service Bonjour Service (Bonjour Service) failed to start. Verify that you have sufficient privileges to start system services.

Error 1921. Service bonjour service could not be stopped. Verify that you have sufficient privileges to stop system services.

This error can be caused by two things:

• The Windows Management Instrumentation service isn't running on your computer.
• Norton Internet Security 2005 is running on the computer.

To resolve this issue, update to iTunes 5.0.1 or later.

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.