Unplayable Audio Files

I have many audio AAC files that will no longer work with ITunes. Currently using iTunes version 9.2.25 They play on all my other Audio players - Windows Media Player, Wondershare Player, Groove Music, MusicMatch etc. I am using the same computer as before.

For some reason all the songs in ITunes have the same length, as 397:40:56. So a song could in actuality be only 2:47 long but ITunes shows the length as 397:40:56.

I though that I had a problem with an update version of ITunes, so I uninstalled it and reinstalled previously working version 9.2.25.

Any one have any ideas?

Thanks,

Paul