I get this error message every time I open Revit "efault Template File Invalid" The default template file you have specified does not exist: C:\ProgramData\Autodesk\RAC2012\Templates\USMetric
I have managed to load a drawing from a textbook site that has the template already in it but I have no templates after my initial install.
You can download the templates from:http://usa.autodesk.com/adsk/servlet/item?siteID=1
Or you can go to Control Panel -> Add/Remove Programs -> Revit Architecure 2012 -> Change/Remove.
There you can add components (templates and families) to your install