Can I borrow my friends World of Warcraft game and be able to install it?

Can I borrow my friends World of Warcraft game and be able to install it?

Would I be able to borrow my friends Burning Crusade and Wrath of the Lich King games dics and install them on my computer?

Update: So if I borrow my friends expansion packs I can just use his key code right? I guess that's what I am really trying to ask.

Best Answer:  You'd be able to install them, but wouldn't have access to the expansion materials without a registration key. Your account with World of Warcraft needs its own registration keys to be associated with it or else the Burning Crusade and Wrath of the Lich King game content won't be "turned on" so to speak. 

Edit: You can't borrow registration keys. If he's already used them, then they're already associated with his account. Unless he lets you play with his account (he'd have to give you his ID and password), you need to create your own account and then purchase the registration keys to associate them with your own account.