Your post indicates you messed up iPhone using IOS 6 and you want to restore it. I am a confused as to how you would have restore available much less a user interface of iTunes, when iTunes latest version requires a Mac OS of 10.6.8.
More confused as the latest iTunes version is 10.7 and your post states iTunes 7.1. What Mac OS is being used on your computer? If you meant iTunes 10.7 several lines below are system requirements to install iTunes system requirements.
Also it is always best: 1) to know when upgrading to a new Mac OS does your computer meet system requirements for the upgrade? and 2) ALWAYS run permissions, verify and fix, verify disk via Disk Utility BEFORE attempting to install a Mac OS and/or apps. 3) Create a backup of the computer BEFORE attempting an upgrade or an update for that matter.
ITunes newest version 10.7
Macintosh System Requirements
▪ Mac computer with an Intel Core processor and 512MB of RAM
▪ OS X version 10.6.8 or later
▪ Safari 4.0.3 or later
▪ 400MB of available disk space
▪ Broadband Internet connection to use the iTunes Store