Trouble connecting to internet through Airport, even with password

I'm trying to connect to one of my available networks to connect to the internet. Other computers (both other OS X and Windows machines) are able to connect just fine, however, when I try to connect and enter in the password, the 'ok' button continues to be grayed out. This has happened for all the other available networks that require a password. Any idea what could be causing this?

Could be a bad or corrupted key chain. Open your Keychain Access.app from Applications, Utilities, and display the airport keychain entry or entries. Make a copy of the keychain first, then delete the airport entries.

Reboot your machine. Access your network as normal and try again. That should build new keychain entries for you. Let us know if it works for.