- try using
this program, just add the mp3 files and let it scan first, so you can see what files have problem and what files don't, then repair, by default it'll back up your mp3 files first (you can change this to not back up in settings, which i don't recommend doing), so you don't have to worry it messes up your mp3 files.
for more information about this program, you can go to program homepage
http://www.gromkov.com/faq/repair/mp3_validator.html
- tuneup media is a good program to auto-tag your library, but i don't use it, i prefer manual tagging because i can tag my own "format", for ex: tuneup would do artist: "Justin Bieber Feat. Whoever and Someone", what I would do (My "format") is "Justin Bieber ft. Whoever & Someone". But before i manually tag i use winamp auto-tagger feature so it can automatically tag for me (like tuneup), and then i change its "format" to my "format" - much quicker. so i don't really see the need of purchasing tuneup
- change windows media player settings so it won't download/replace/change your artwork or tags