Unspecified error , causing inability to acess internet

I have had my Norton internet security for the past couple of years and it has always worked fine without any issue ...  until today where i cannot access it at all . if i click it nothing happens and it will not allow me to access the internet no matter what i do . If i click on any of the norton onscreen buttons i just get this message

 

C:\Program Files(x86)\NortonInternetSecurity\Engine64\21.7.0.11\uistub.exe

Unspecified error

 

 

I have never had any issues with it before ,    Im running  Windows 7 and it has never had a issue running with it before.

Please help

Many thanks