Opened the music store in iTunes as a separate window. Now every time I try to close the music store window, iTunes shuts down. Tried going into preferences, but nothing seems to apply. Have also shut down the compuer and rebooted, but same senario
Try deleting your itunes preferences in /users/<name>/Library/preferences. It's called com.apple.itunes.plist. That's probably where it keeps window settings. Don't worry, this won't affect any playlists or music info. If that doesn't sort it, please post your crash log that you get when you hit report on the unexpectedly quit dialog.
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By the way, welcome to AppleInsider. You might want to check the Genius Bar forum too. There are people there that are looking to help.