Library/Settings Removed from iTune

I haven't used my itunes in about a 3 DAYS. Today, I turn it on to import a few CDs and everything is set back to normal. The only songs in my library are the 50 or so I bought from iTunes. The other 4000 are completely gone. There's not listing or anything for the songs. Playlists are gone. Videos are gones. Everything.

I checked and the media folder location was set back to the original My Music/iTunes/iTunes Media. My music is actually at E:/iTunes, everything is still on the external drive, so nothing was deleted. I tried changing the media folder location back to normal but nothing went over. I don't want to have to re-import 4000 songs and re-get album artwork, song titles, etc.

I think iTunes my have updated without me knowing and reset it's settings. Is there a way for me to restore itunes to the way it was previously?