I am running SCP 7.9.0 build 7929

This morning I have attempted to log into SCP. I was able to get to the login screen but after adding sign in details SCP just hung. 

I have ended the service via Shutdown.bat and on the starting of the service via run.bat)  I get an "Invalid License file" with error code 523. The service now will not start - so no helpdesk!!

The license files shows that the expiry date is 03/04/2015. 

An ideas please? 

Many thanks,

Lucy.