My 4g iPhone isn't connecting to my iTunes!?

I just got the 4g iPhone. I've connected it to my iTunes before, and downloaded half of my music, but had to interrupt the sync because i had to go. but when i went to do it again later (to get the rest of my music) the icon didn't show up on iTunes, and then it said "iTunes could not connect to this iPhone because an unknown error occurred." So obviously it was connected to the computer for sure. I have the latest version of iTunes, AND i tried restarting my computer (it almost worked because the error message didn't show anymore) but the icon still didn't show up! The only other thing i can think of is uninstalling and reinstalling iTunes. is there any other way??
 
Top