hard drive got crashed . now i want to activate in new PC.?

What problem are you having with activating on a new machine?  You just need to install and activate.

Download and Installation Help -

https://helpx.adobe.com/download-install.html

You might want to contact Adobe support thru chat and ask them to reset your activations so that you still have the option of activating on two machines.   For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...

Serial number and activation chat support (non-CC)
http://helpx.adobe.com/x-productkb/global/service1.html ( http://adobe.ly/1aYjbSC )