My computer is authorised however some of the songs that I have downloaded wont play?

I have just downloaded some music from Itunes. Some of the songs will play but some say that I need to authorise the computer. I put in the details, it comes up with a box that says 'the computer is already authorised and that I have used 4 or the 5 authorisations available' however the songs will not play. It a repeating loop, I click on the song and it tells me that I need to authorise again. All of the songs were downloaded at the same time to the same computer?

Interestingly I have been into the Itunes Store and looked at the items that I have downloaded and they seem to play fine. But in the library it keeps saying that I need to authorise the computer when it is already authorised. I have already deleted it and re-installed it but nothing...... When I go to the track that doesnt work there is nor Purchased By information (although the apple ID is present). The other songs that do work, do have the Purchased By information. Will this be the cause of the problem? how on earlth do I get around it?

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