If you installed the new Windows 8 RTM, Enterprise edition you might have the surprise to see that it cannot be activated. The errors can vary, two examples are 0×80070003 - The system cannot find the path specified, or 0x8007232B, DNS name does not exist. Most probably you installed Windows 8 Enterprise without adding any license key to it (because Windows 8 Enterprise never asked for a key in the first place).
The reason is that Windows 8 Enterprise installs by default with an included KMS license key (you can type slmgr /dlv in the command prompt window to figure out which one is it, mine ended in CWCK7). If you have a valid license, you can use the following command to install/activate the real key.
slmgr -ipk “valid license key”
Input your valid key including the dashes. Windows 8 will install and automatically activate your computer.
Previous Windows versions included the capability to change the key by navigating to Computer->Properties->Windows Activation, but at least for Windows 8 Enterprise this feature seems to be missing.