I installed an adapter and it is said that the security key does not match w / Linksys in my main PC WHY?

I bought a second computer and install an adapter so I can access the Internet, but when I need to enter the security key that indicates that mismatch. My main computer has the Linksys Router and I have also installed Internet connectiong good there. I have the correct security key and the passphrase but do not know what is wrong Can you help? thanks

If the write in the WEP (security key) and not two boxes, type in the security key on both. Sounds like one of his only introduction the security key in a box and not the other or their lack of spelling key in one of the boxes.

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