Can't validate CS6 Photoshop

Please follow this , it will resolve the problem -

http://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html

CS6 activation requires an Internet connection to an Adobe activation server.  You must be connected to the Web and an Adobe server connection must be established and the server must be able to write credentials to you machines Hard Disk or SSD.   If you have two active activations activation will fail.  Activation will also fail if you don't enter a valid key.  If you have activated CS6 in the past you can sign in to Adone.com with your Adobe ID and Passworf click on the My Products link and retrive you CS6 product key.