Fix for iTunes 5002 Error
Since upgrading to iTunes 7.3, I got the following error when searching iTunes Store for songs: “We could not complete your Music Store request. An unknown error occurred (5002).”
This problem is related to the iTunes shopping cart. To fix, go to edit/preferences/store, activate one-click shopping and press OK. The problem should now be fixed. If you want, you may also now re-enable the shopping cart.