What I'd do, to force gain permissions on all files/folders, is the following:
1.) Open command prompt as admin
2.) CD to the place where the music is at (i.e. CD C:\Music). If the content is on another drive (e.g. E:\Music), do this:
3.) To take ownership of the files, do this:
For example, if I had files stored on drive F:, folder Music, I'd do this (open cmd.exe as admin):
Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.
C:\Users\Lavanoid>F:
F:\>takeown /f Music /R
Once you've done that, go to Windows File Explorer and right click on the folder you wish to take permission of.
1.) Click properties
2.) Click on the security tab
3.) Click on "Edit"
4.) Click on "Add"
5.) Type your username into the field, then click OK.
6.) Tick the "full control" box, for your username, then click Apply and OK.
That's how I do it.
Edit: This also works for editing system files
