What is the make & Model of the router?
I would definity suggest checking it is set to WPA in preference to WEP.
If you have forgotten your passwords then the only way to fix it is to reset the router and reconfigure it.
Make sure you use a LONG, Strong Passphrase. There are plenty of password generators available on the internet.
Just make sure you also change the passphrases on all hardware connected to the router so they are all the same as well.
Born2fly