My iphone doesnt show up in itunes?

I just downloaded iOS7 and when i plugged it up itunes said to download the newest version to continue so i did. I go back to sync my phone and now my iphone doesnt show up in itunes. I tried the reboot and everything. How do i get it to find my phone?

Shut down you computer try again. If that doesn't work manually uninstall and re-install iTunes. Odds are you're running an older version.

http://support.apple.com/kb/HT1923