Nvm. Solved it. It had nothing to do with the user profile folders. I just right-clicked the "Documents" folder on my desktop (the one I made myself) and went to the Customize tab. I clicked "Change Icon", changed to something random, then applied. I went back, and clicked on "Change Icon", but then clicked "Restore Defaults", and everything was back to normal
Just to clarify, it used to look like a folder with no item preview, but then it changed to a folder icon that looked like the "My Documents" icon, and now it's back to a legit file preview.
Thanks for the help though, Brink.