I've tried just about every Youtube converter there is. And the same this always happens. I have Windows. I follow the directions and convert the YouTube video to mp3, upload it to my Itunes. And it plays. But later when I listen to other songs and go back to the converted song, it says it can't find it. I need help!

I like the Firefox extension DownloadHelper it is free and downloads and converts videos from the web. If you don't have Firefox you can get it here.