Help!  Am getting error messages trying to sync

I have an iPhone 3G that was running fine until I updated the software to 4.2.1 about a month ago.  Everything has slowed down and some apps have started crashing when they didn't before.  However, the main problem now, as of a few days ago, is syncing.  The first error message I get is:
"iTunes could not back up the iPhone "iPhone" because a session could not be started with the iPhone." 
I then click "okay" and immediately get a 2nd error message saying:
"iTunes could not sync information to the iPhone "iPhone" because another sync session was alreay running."
There was no other session running and I have tried not only closing iTunes and restarting, but rebooting my computer.  Messages still appear each time I try to sync.
I would really appreciate any guidance on this as Apple Care has now expired as my phone is 2.5 years old (purchased in Europe legally unlocked for about $900 -- so I'd rather wait it out until iPhone 5).
Thank you.

I think I recall another poster on the forum saying that they were getting this error when they tried to sync music that was corrupted in some way. In that case, they used something called "MP3Diags" to search for and repair music files that had problems.
To test this, try syncing a smaller set of music.. just just one album ... and see if you get the same error.
i

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