I currently play WoW and have WoW + TBC installed on my machine with the BC discs. I am buying a laptop for college soon and I am wondering how to install the software on my new laptop. I will no longer be using my current machine. Some people have told me that I can just simply download the trail BC version from worldofwarcraft.com, while others tell me I need to buy the game over again. What do I need to do to play WoW on my new laptop?