Mac Forums

Ok, so somehow all of my family's music was wiped off our itunes (don't ask how, cause we really don't know!) anyway, our music was all saved on our computer in some folder, so we copied it all back onto out itunes library. But now, when we try to connect our ipods, it says: "This is not the same itunes library it was synced with before." But with my ipod, it doesn't even recognize it or even come up on the side bar. So, I tried to put my ipod songs on my other computer's itunes library. And a sign came up asking me if I either wanted to erase and sync my ipod, or transfer my purchases. So I transferred all my songs to the new library, but the problem is that not all my songs went onto itunes! I have about 500 songs and only 172 went on. Does any body know how to fix my old itunes so it recognizes our ipods, or how to put the rest of my songs my other itunes library??
PLEASE HELP ASAP!!!