Error while performing operation Web.config Error is Blank

Hi I'm getting an error when trying to access a website with standard install of Filemaker Server 13. 

I'm on Server 2012.  The error message comes up when trying to access any of the panels in IIS.

'There was an error performing the operation' 

Details: Filename \\?\C:\Program Files\Some Path\web.config

Error:

The Error is blank which isn't very helpful.  I have added IIUSR permissions to webconfig.  

Going to localhost gives me an additional error code of: 0x8007000d

However the Config Source just says:

-1:
0:

So again, that is really unhelpful.

I've done a full re-install of IIS including URL Rewrite so I am not sure where to go from here... any suggestions?

Thanks