iTunes HELP

[moderngamenewb]

I upgraded to 10.7.2 today, then upgraded my iPad to iOS 5. It was jailbroken so I restored it and then upgraded to iOS 5. I had it syncing to my last backup. It was in the middle of syncing my songs, and was 90 percent complete, yet, it says that it could not sync because the song (example, Tom Petty-Breakdown) couldn't be synced because the iPad could not be read or written to. I hit restore and tried again, it did it again. I tried to copy the song file to my desktop (so I could delete it and re-add it) and I get error code -36 (The finder can't complete the operation because some data in "04 Breakdown.m4a can't be read or written." It's done that with a couple of songs, but not others. I don't get what is going on. I never had this problem in 10.7.1, and I can't complete my sync at all