How do I download FLV files to a MP4 Digitrl player?

Please just tell me in very simple steps, we are using Windows XP, what software will do this for a total beginner ??

step 1, download the youtube flv video to your convert flv to 3gp computer at first, here is a free youtube downloader,

step 2, convert flv files to MP4 format, here is youtube download flv a free flv converter for you,
all this can be finished by several click, have a try.