Only you can tell if those approximately 100 songs that aren't recognised happen to be in another format than mp3. And if that's the case only you can tell what format they are in.
And only then can we advise you about a way to convert them.
I have approximately 500 songs on a memory stick but my Samsung 3d plasma TV is only recognizing about 400 of them. I don't have any problems with the stick when I connect it to my PC. Does the TV only play music downloaded in MP3 format? If so, is there a way I can change the songs to MP3 format?