Cannot Edit MP3 infos in iTunes After installing Windows 7

[rolanddes]

Hello everyone. I recently installed Windows 7 on my Samsung Laptop. After acquiring windows updates, i installed iTunes. When i added all my mp3's to iTunes library i realized that i am not able to edit infos of them. I guess i did not check an option that said roughly "let the changes that i make in iTunes effect the files on my hdd" while installation of iTunes. I do not know the problem is this option or something about Windows 7. But i want to know how can i change this option or bypass this problem? (i took ovnership of the external harddrive that contains my mp3's but that did not help either)