Do you have at least one computer which has connected to that router via wireless? If so, the password should be stored in that computer.
If that computer has Windows 7, there is a built-in function to display the password. Go to:
Start > Control Panel > Network & sharing > Manage wireless
That will being up a list of routers. Find the correct one, right-click and select "Properties".
That will bring up an info box for that router. Select the "Security" tab, The security key (password) will be hidden behind asterisks. Place a check in the box for "Show characters". That will display the password
If the computer which has connected to the router has an older operating system (Vista or Windows XP), then you may not have that built-in password display feature. But you may still be able retrieve the password by installing some specialized software.
Here are two suggested free software programs to display wireless passwords:
WirelessKeyView by Nirsoft:
http://www.nirsoft.net/utils/wireless_key.html
http://www.softpedia.com/get/Security/Decrypting-Decoding/WirelessKeyView.shtml
Advanced Password Recovery by Josh Cell Software:
http://www.joshcellsoftwares.com/2011/08/advanced-password-recovery-password.html
http://www.softpedia.com/get/System/Back-Up-and-Recovery/Advanced-Password-Recovery.shtml
Hope that's helpful.
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