Q: I keep getting an "unknown error -42408 message and it won't let me buy music?

Hello suesq75,

This error message indicates that there are one or more components of iTunes that are missing or damaged. Reinstalling iTunes should resolve the issue.

iTunes: "Error 42408" or "Error 42404" after upgrading to iTunes 9.0.3

http://support.apple.com/kb/TS3258

Symptoms

If your iTunes is missing resources or encountering software conflicts, error -42404 or -42408 may appear when authenticating or downloading from the iTunes Store.

Resolution

Update to the latest version of iTunes.

You can download the latest version of iTunes here.

Note: iTunes 9.2.1 is the highest iTunes version available for Mac OS X v10.4. iTunes 10.6.3 is the highest iTunes version available for Mac OS X v10.5.

Cheers,

Allen