#7 - Oct. 8, 2010, 1:21 p.m.
You are more than welcome to install the game on as many computers as you like, Asmyna.
As Daniera mentioned, to save time, you can copy the full game folder from one PC to another.
**Note** This step will not work if you are using a Mac.
If you simply want to install and not copy over the game folder, feel free to use your Wrath of the Lich King DVD. This will reduce the amount of patching required.