iTunes error 54

It is interesting that some of the songs are not synchronized, but always different, when they re-synchronization to be copied, and the phone displays, but do not play. I reinstalled iTunes, updated iOS, and even recently reinstalled Windows (8.1), the result is the same. But I tried to sync with a working computer (Windows 7 and last version iTunes), there's iTunes folder location is not in the folder with the music, so I manually add music, then all the synchronized. When I get back from work, I'll try to do the same on your home laptop and let you know the result, can someone help.

I was not able to fix the error 54, but I found the reason, it only occurs when converting songs, if not select "Zoom bittreyd up to 128", copying takes place without errors. Now I deleted iTunes, I downloaded an older version of iTunes (11.4, earlier do not support iOS 8), however, I see an error 54 periodically, but the music is converted and synchronized after pressing "OK". I will use this version of iTunes, until Apple will fix iTunes, I hope they will listen to us and in the new version to fix it. Good luck!