Enable Wireless

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http://crunchbanglinux.org – I have been using an external wifi adapter to connect to the internet. At first NetworkManager gave a choice between connecting through my builtin wifi card or this external adapter, but later (perhaps after restart) I could only choose the external adapter. Now the external adapter is broken so I need to use the builtin card again, but it is not a choice in NetworkManager.Any ideas? Do I need to uninstall the external adapter driver? (HowTos)