ITunes 9.0.2 - computer autorization glitch when syncing downloaded apps

The apps I've downloaded for my iPhone via the iTunes store will not sync to my iPhone.
I get an error that says my computer is not authorized to use these apps and when I try to authorize my computer iTunes store gives me a further error message:
"There was an error storing your authorizaion information on this computer"
"The required directory was not found or has a permissions error. Correct this permissions problem and try again, or deauthorize this computer if the permissions error cannot be changed"
I have tried to find the permissions error with no luck and tried to deauthorize my computer in iTunes which brings up the same error message as above.
Can anyone advise as to what's going on? Never had this problem before upgrading to iTunes 9.0.2...

Download a fresh iTunes.dmg. Close iTunes.
Then to get itunes to install from the .dmg you will need to go to HD>Library>Receipts>iTunesX.pkg and remove the iTunesX.pkg to the trash.
Put the iTunes app in the trash.
Backup the 2 files iTunes Library and iTunes Music Library.xml (located in HD>User>User Account>Music>iTunes. Keep the b/u in a different location.) Reinstall iTunes. Launch iTunes. If all works and you are happy you can empty the trash.
MJ

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