Just subscribed to Nostalrius, need help :D

Hi all guys, I just subscribed to Nostalrius and I'm downloading the game right now. To complete the installation and play do I need to get rid of my WoW: WoD files? I ask this bcs I'm still playing on WoD with my friends, and if I have to remove them it would be a prob. So, can I play both original WoW and Nostalrius on the same PC?
best regards, DragonReborn.
best regards, DragonReborn.