Hello Sudeepthapa,
The error code 0x8007232B translates the error message "DNS name does not exist". This error message occures when the user attempts to Activate their KMS Client version of Vista without entering the location (or entering an incorrect location) of the KMS Server within the user's network.
Frequently Asked Questions About Volume License Keys for Windows Vista:
http://www.microsoft.com/licensing/resources/vol/ActivationFAQ/default.mspx
Windows Vista Volume Activation 2.0 Technical Guidance
http://www.microsoft.com/downloads/details.aspx?familyid=9893f83e-c8a5-4475-b025-66c6b38b46e3&displaylang=en
Volume Activation 2.0 Overview Guide:
http://technet.microsoft.com/en-us/library/cc303274.aspx
Thank you,
Darin Smith
WGA Forum Manager