i'd installed the diablo 3 starter edition yesterday and decided to buy a hard copy (CD) of the game and upgrade my diablo 3. The question is, do i have to reinstall the game using the cd or just use the cd key to upgrade the game?im scared that after i bought the game and use only the cd key will not upgrade my diablo 3. I need someone to explain it to me and your help would greatly appreciated sorry for the broken english lol -.-