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Consider the following scenario:
You are running a Windows Vista-based computer that includes Windows Media Center.
You connect the computer to a secure wireless network.
You install a non-English-language Input Method Editor (IME), and then you set this as the default IME.
When you start Windows Media Center and then try to join the secure wireless network, you are prompted to enter your Wired Equivalent Privacy (WEP) key. However, when you use either the keyboard or the remote control to enter any numeric character in the WEP box, the default IME setting is triggered. Therefore, you cannot continue entering the WEP, and you cannot connect to the secure wireless network.
To work around this issue, do not include any numeric characters in the WEP key when you set it up.