A couple of things. In the v1, the Music folder is hidden, and reverts to hidden after rebooting even if you change the attribute. It’s crazy, but that’s normal behavior. And your computer only sees music tranferred in one mode at a time, MSC or MTP.
Are you sure the songs are tagged? Have you scrolled down the Album or Artist list to see if there’s an Unknown? Files that are not tagged in ID3v2.3 won’t be indexed by the database. You can fix them with mp3tag. Under Tools/Options/Tags/Mpeg set Write to ID3v2.3 ISO-8859-1. Then navigate to the album folder, highlight all the files and Save.
There’s also a possibility that the files that play in your computer, even if they say 01-song.wma, are .wma pro or .wma lossless, which the Sansa won’t play. Look at them with the Gspot codec appliance.
http://www.headbands.com/gspot/
WMP works better in MTP mode. You might try looking at support.microsoft.com for the MTP Porting Kit, and see if installing that helps. Or try rolling back and then reinstalling WMP 10 or 11. There are other suggestions in the link in my signature.
Me, I just drag-and-drop albums in MSC mode. (I have Windows set to Show hidden files and folders.) But if you’re hooked on WMP playlists, your best bet is to get MTP mode working and use that. WMP connects in MSC mode, but all the playlist functions work better in MTP.
If you’re willing to format and start over, put it in MSC mode, right-click and Format to FAT32. And if that fails, try right-clicking on the Sansa, Properties, Tools, Error-Checking to see if it can fix what might be a corrupt file, then try Format again.
Make sure your music files are .mp3 or basic .wma, drag them over, and see how it goes.
