iTunes can't find music on my new computer, songs are 'unchecked' & won't play
I had iTunes installed on my old computer, and had lots of playlists set up. When I recently bought a new computer, I used an external hard drive to transfer all my music files to the new computer, and then I installed the latest version of iTunes on my new computer. When I opened iTunes, all my songs and playlists were listed, but all the songs had little exclamation points in front of them, and all were "unchecked" -- and therefore none of them will play. When I try to play a song, I get a message telling me iTunes cannot locate the file, and I have the option to locate it manually. I obviously don't want to do this tedious task for each and every song -- there must be a better way. Any solutions?
iPod nano, Windows 7