I don't like the store being shown in my iTunes sidebar, but suddenly I have an issue. With the checkbox in the Parental preferences to disable the store ticked, the word STORE is still shown. I have unticked and re-ticked, and tried deleting com.apple.iTunes.plist. This has survived a system restart and repairing disk permissions. I have not recently changed anything, and don't have iTunes plug-ins or hacks.