you used a restore cd (that's different than a backup). A restore CD will reset your computer back to the same state it was in when you bought it. All of the files on your C: drive were wiped out during the restore. I hope you had some backups of your data files and MP3s... You will have to reinstall all those programs that you had installed after you bought your PC. The data files associated with those programs are gone unless you backed them up.

http://www.taobackup.com/