recently deleted Itunes library by selecting all and deleting. I have all of my music in one folder on my external hard drive. Upon reinstalling that folder to itunes, realized that hundreds of tracks are missing. Only certain cd's that i burned are missing and not the most recent. I ran a system restore and all the folders came back, but the actual tracks are missing, I did not manually back up my library before this, thinking that all my music was safe. All the music was burned through itunes on this PC. Other files I copied from my laptop are safe. Very perplexed..