My Music Folder Image - Restoring It Back To Normal?

In winamp, all my songs that are in my music folder all have the same, incorrect album art unless they are in another subfolder with their own album art.I narrowed down the problem to the fact that when I put my documents folder into thumbnail view, the art appears on my music folder, rather than the default my music folder icon.I have looked everywhere in this folder for this image, which was originally on some music my brother was downloading and deleted a long time ago and cannot see a way of restoring it back to normal.
This is what it is like in my document and the album art on the my music folder is on every song inside that isn't in a subfolder:gured out why. I had to turn on display system files and delete them manually. I guess I shouldn't have just tried show hidden files