I already have the game installed with a friend's CD. He already has an account with the key. I just bought my own copy to get my own account. Do I have to reinstall the game or can I just use the key in this new game through the already installed software ??
I'd play it safe and uninstall it, and reinstall it using your new legal copy of the game/key
I agree with Hfx_Rebel, it is best to reinstall it.. besides reusing a key on a CD is generally against ToS and EULA ;-)
I'd actually disagree, and say there's not really any point in reinstalling after you've got it set up, configured, and all the patches downloaded. The key has nothing to do with your CD's, but is used to authenticate an account, which is done at the WoW site. Just make an account with your key and play on old installaton.
To each his own...Nothing wrong with having choices
just keep yur old install, theres nothing tied to that one about account info.. or somthin