Just upgraded from XP to Win 7. I'm the sole user, and therefore in the Admin group. Also just installed MP3Tag, but get an error message (File xx cannot be opened for writing) if I try to modify anything. I can rename the files outside the program, so I know I have permission to modify them. What's preventing the utility from doing so? (I freely admit that I'm not up to speed on permissions, ownership, and the like, so I need a pretty simplified answer).