Problem connecting wirelessly to router

I am having problems connecting to a router. I know it works because another computer can connect, no problem. It requests a WPA-2 password and the other computer enters an 8-digit code and they connect, no problem. My MacAir reconizes the network (router) but won't accept the same code the other laptop sitting next to me is able to use. The laptop that can get in asked for a "security key." The Mac asks for a password. Not sure if the nuance makes a difference. Has anyone else had issues like this?

Welcome to Apple DIscussions.
This could be a problem with the router settings as much, or more, than the security settings.  Follow the link if you own/have access to the router setup software.
Help us help you. The more complete the description of your problem is (what MBA you're using - there are many versions going back to '08, what OS you're using -there's a lot of those too, what Application you're using there are many, a full compete description, the text or screen shot of any error messages) the more assistance we can provide, and, the sooner we can provide it.
WFIW many users who have recently upgraded to Mavericks have reported a lot of WIFI problems... connecting, and maintianing connectios are among them, that's why the age and OS of your machine are pertient bits of background that can help find a solution to  your issue.

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