How to learn computer password for a router

Hello,
I just bought a new laptop , wireless computer. when I tried to connect to the wireless, it keeps telling me I can't. I have to password written down, I thought I knew what it was, but no version of it is taking. what could O be doing wrong?
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More about learn computer password router
  1. The password is case sensitive if it is an ASCII password.

  2. Go Start then Run in XP - Windows key plus R in Vista and Windows 7, then type in the following, including all the spaces:-

    cmd /k ipconfig /all

    then press Enter and from the black form that shows up, take a note of the numeric code beside the Default Gateway icon - something like 192.168.0.1.

    Type exit to close the black form.

    Open Internet Explorer and enter that code into the URL address bar as though it was a website. You're then at the login page to the router's settings utility and admin will usually be the login with either admin or password as the password.

    If you're in, seek out Wireless and then Security and take a note of the key. Sometimes it may be a passphrase, some a simple set of letters and others a hexadecimal code. You also may as well note which level of security it is - WEP, WPA or WPA/PSK 2 and then either AES or TKIP. Your computer will already know this but it's handy information to store. Note also that hexadecimal only contains numbers from zero to 9 and letters a to f so there's no confusion of I and O with 1 and 0.

    Keep a note of that security key in My Documents and also outside the computer.

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