5002 Error then, says Itunes cannot Authorize my account

New Macbook, but I have used itunes for years. When I set up HomeSharing on my PC, everything is fine. I can connect with itunes, the Store, and the computer is authorized.
When I get on the Macbook to start Homeshare, it says I need to authorize, and when I try to authorize it, it either gives me a 5002 error, or it tells me I need to authorize my account. BUT when I get to the store, I can log in and download music, just not play any old music I have purchased.
Please HELP!!!

Hello, norman larry scott, jr. 
Thank you for the question.  Normally when I see this error, it has to do with syncing photos.  I am unsure if you have the preference to sync photos from your Mac to your devices however.  See the section labeled iPhoto or Aperture in the article below.  This may resolve the issue with the error that you are receiving. 
iTunes: Understanding the iPod Photo Cache folder
http://support.apple.com/kb/TS1314
Make sure to test the results by processing a sync after these steps. 
Cheers,
Jason H. 

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