Trouble syncing iPhone 4s with iTunes (sync won't start)

When I plug my iPhone 4s into my computer, both my computer and iTunes recognize it and nothing seems out of the ordinary until I try and sync the phone with iTunes. After pushing the sync button, the top of itunes says "Syncing iPhone (step 1 of 7)", and under that "waiting for sync to start", but after a minute or so a pop up box appears that says the sync could not be completed because it failed to start. I've tried all my USB ports, multiple cables, both my phone and itunes are completely up to date. Any idea what could cause this problem?

Is 10.6.6 the current 10.6 version?
If not, update to the current version.
http://support.apple.com/kb/TS1591?viewlocale=en_US
Update to the latest version of iTunes and Install software updates on your Mac.
If no change after that, try reinstalling the Apple Mobile Device Service.
http://support.apple.com/kb/ht1747

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