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I get this error message every time I open Revit ":Default Template File Invalid" The default template file you have specified does not exist: C:\ProgramData\Autodesk\RAC2012\Templates\USMetric\DefaultMetric.rte
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=123112&id=13192741
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