Not able to manage Secure Store Service in sharepoint 2010

I created a new instance of Secure Service Store and then when I click Manage system gives the following error message:

Cannot complete this action as the Secure Store Shared Service is not responding. Please contact your administrator.

I read somewhere to ensure the service is started.  when I check under server services I see it is started.  but when I stop it and restart it again it gives an error that Object Already Exists.  I found the only way to start it is to delete Application service I created.  But with this I'm not able to complete my settings for perfomance point services which requires secure store services to configure the unattended account.

Any help is greatly appreciated.

Thanks