album artwork not appearing

first time poster so bear with me here. heres the situation. when i click "get album artwork" for some songs, it doesnt work. at all. for example, i uploaded the cd "catalyst" , by new found glory, into itunes and the album artwork didnt come up. i searched itunes store and found the same cd, but it still doesnt work. the artist, album, song name, composer, album artist are all the same, no spelling mistakes or anything. it happens with alot of my music. can anybody help? im running 7.1.1.5 if that makes any difference

HP Media Center Windows XP