I have installed Revit Architectural 2012 and when I press "New" I get the following error message "Attempted to access Default AUSENU.rte past its end". How can this error message be removed and can progress into a new file?
A "past its end" error typically indicates a file error of some kind. You will have to resort to a back of that RTE file or re-create the template file. The original one you are attempting to create a project from has been damaged in some way.