Symptom
When you try to install iTunes from the Software Install disc, an alert box appears with a message that says the disk is locked and the installation cannot take place.
Solution
The iTunes installer cannot install software on your computer's hard disk if the Software Install disc was used to start up the computer. Restart the computer using the hard disk as the startup disk, or follow these steps:
1. Copy the iTunes installer folder from the Software Install disc to the computer's hard disk.
2. Open the iTunes installer.
3. Install iTunes onto the hard disk.
4. After the computer has restarted, drag the iTunes installer to the Trash.