I Tunes 9.0.3: New I-Tunes Update Screwed my Music Library?

I loaded up I-Tunes and updated it to  the lastet version (9.03) and when it updated everything, my music library was gone all the playlists i made as well. What the hell kinda shit is this? I detest I-Tunes its far too restrictive and screws the consumer when you buy music.

How the hell do i get my library back, now ill probably have to wipe my I-Pod and start again thanks a fucking lot apple.

EDIT:

Luckily i backed up my PC yesterday with “Symantic Backup Exec System Recovery 2010” which is very useful for keeping a backup of your PC. So i had to copy the old I-Tunes Library File from a few days ago over and its all working now.