I have the same problem, once the installation is extracted all the content folders under 'C:\Autodesk\Autodesk_Revit_2013_English_Win_32-64
Same problem here..... when i m installing revit 2013, it "freezes" at the end of the revit installation... with a dialog box "Prepering Revit Content"... it stays there forever!!! here is a picture
The content for Revit, like Libraries, Familes and Templates, is downloaded during the installation process. Depending on what content you have selected and your internet speed this process can take some time.
This helped for me:
Go to your Internet options and the Security tab. Select Trusted Sites and click on the Site button and add .autodesk.com to the list and close and apply changes by clicking OK.