Media Files Not Letting Me Edit Info

Recently my music files [it might be with other types of files too, I haven't checked] have somehow changed the security setting so that I can't do anything with them, I can't edit the info in iTunes and I can't delete the files. About the only thing I can do is move the file. I have figured out how to fix this problem one by one with each file (going into properties, security tab, and changing the permissions), however, I've only been able to do this one by one and with each new file the same problem persists. Is there any way I can change some sort of setting or something that allows me to have full control over all files? I am the sole user of the computer, therefore I am the administrator.