Using the CEM to enable WEP.
Use the Client Encryption Manager (CEM) utility to set a Wired Equivalent Privacy (WEP) key for your client adapter.
The default password is Cisco (uppercase C followed by lowercase isco). On older versions of CEM, try the default password Aironet.
It is recommended that you change the password. If the default passwords do not work, or you forget the password, you must reinstall the CEM utility.
Configure / Configuration issues
WLAN adapters (wireless card) / ACU (Aironet Client Utility)
Client Encryption Manager (CEM)