My macbook air can't connect to wireless isp fails? other computers macbook pro are logging on

Hi My Macbook air isp is failing when i try to connect to wireless however other computers can acccess the wifi
. Can someone suggest what to do?

Hello, gushingstream. 
Thank you for visiting Apple Support Communities.
Here is an article I would recommend going through when experiencing issues connecting to Wi-Fi.  I would also make sure all firmware updates have been processed on the router.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Cheers,
Jason H.

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