what password are you trying to find?
to get into your wireless router? see:
http://www.routerpasswords.com/index.asp
to get your ipt to connect to your network? this may be a problem, unless your router shows you the wep, wpa, wpa2 password out in the clear. mine actually does< once you log into the web interface.
if you can log onto your access point, and if doesnt tell you what the password is, you will need to change it. then you will have to update all the things that do wireless through it.