I have lost my kaspersky internet security activation code.how can i regain it

Hi gopinathclas,
Detailed instructions can be located at the link below for recovering your activation code:
http://support.kaspersky.com/faq/?qid=208281826
-Tim

The only way for you to regain your activation code is to contact Kaspersky tech support and supply the account credentials and confirm that you are the account owner and they should supply you with an activation code.

http://usa.kaspersky.com/about-us/contact-us