Thanks a lot bill.
I unstalled the Qlikview Server as I could see some licence key inside the licence tab and I was not able to check what is the licence key on our production Server as I do not have access.
Deleted the ProgramData-> QlikTech Folder manually and reinstalled the qlikview Server (full install, single server installation).
Restarted the services and applied the key and it started working.
Thanks a lot.