Q: when i updated to the new itunes it stopped syncing to my iPhone 4S

When I updated my iTunes to the latest eddition it stopped syncing my iPhone 4S.

I have deleted itunes then re-downloaded it and that didnt work, i also tried restarting my computer to see if that would do anything and it didnt and it is really frustraiting me now!!

any help on what i can do to get it to work will be greatly appreciated!