I bought and installed a WD My Book external hard drive on my PC with Windows XP. Moved my iTunes library to the EHD and got it working. Decided I don't like the WD and going to exchange it for a Seagate. So I restored my music library to its origanl place in C:/documents and settings/user name/my documents/my music/iTunes/iTunes music. iTunes shows all the music but when I click on a song I get a message that says "...the original file can not be found." What do I do to fix this? Thanks for your help.