W7 & Clip+: USB mode MTP not working

If the player doesn’t show files on it, it may be because the files are in a format the player doesn’t support. Imo the best idea is to keep things simple. If you music files are not protected, then use MSC mode, and use Windows Explorer to copy and paste folders of songs to the player. MTP mode causes all sorts of problems, as does syncing. I avoid both of these.