Two syncing errors !!

I just started getting two error messages as the sync process begins.

1. MobileBackup has encountered a problem and need to close. We are sorry for the inconvienence.

Then I click on "don't send error report". The # 2 comes up....

2. I-Tunes:
The "Apple's I-Pad" cannot be synced. An unknown error occured (-53).

Someone said there's a corrupt file somewhere. I deleted tunes and all it's accessories a few times using Add/Remove but no luck.

Anyone see this before?? Thanks...Ken