Account access and permissions issue

10-11  Source: Network gathering  Views:0 

When I try to synch my iPod, I am informed that I will lose my purchased music because my computer is not authorized. When I attempt to authorize the account in iTunes, I get an error stating that the required file is not found or permissions error. My apple account is easily accessed and can be used for purchases, but not for synching. I have tried deauthorizing my second computer and have checked for permissions errors, but can find none. I asked this question in the iPod section with no answers--it would appear to be a system problem rather than an iPod issue. Thanks for any ideas on how to solve this puzzle.
One of the following articles should help you:
iTunes- Missing folder or incorrect permissions may prevent authorization
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
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