Hi,
you should be able to access the controller by the following way:-
Step 1 Connect your PC to the service port and configure it to use the same subnet as the controller (for example, 192.168.10.1).
Step 2 Start Internet Explorer 6.0 SP1 (or later) or Firefox 2.0.0.11 (or later) on your PC and browse to http://192.168.1.1. The configuration wizard appears.
it is possible that the issue is windows 7 which you are using. Please check with XP or any other machine to make sure windows 7 is not causing the issue. Please check the config guide for step by step access:-
http://www.cisco.com/en/US/docs/wireless/controller/7.0/configuration/guide/c70intf.html#wp1142477
Once you are able to access the controller, then you can setup WEP:-
http://www.cisco.com/en/US/docs/wireless/controller/7.0/configuration/guide/c70sol.html
thanks,
Vinay
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Thanks & Regards