How to find devices installed with Norton 360 in Norton Account

I recently updated my Norton 360 software.when checking the status I realised that my Norton is active on 3 PC's,however I am only aware of 2 of these PC's,I unfortunately did not have device manager active.Is there a way that I can search for the names of the devices my Norton is active on.any suggestions would be gratefully appreciated

 

 

[Clarified Subject]

Have a look at

 

http://community.norton.com/t5/Norton-360/After-upgrade-no-subscriptions-available/td-p/945095/jump-to/first-unread-message 

 

where I just now answered a similar question ....