Whats the problem? You do kmow you can change it back to the classic view don't you....
Ah no I know that sidebar trick, but still couldnt get on with it. I rolled back to 10.7, Google is your friend Tysonator (along the lines of use and old itunes library file, delete itunes with appzapper, find 10.7 download).
If you are Windows then yes (I use AppZapper on OSX to get rid of programs fully).
https://discussions.apple.com/thread/4559563?start=0&tstart=0
Unlikely, do a backup of your itunes folder just in case.