Premiere CS6 hanging on ExporterAVI.prm after an upgrade from Vista 64bit SP2 to Windows 7
This is most likely related to an AVI codec not loading properly after the upgrade.  In my case, I had the Matrox VFW software codec installed.  Uninstalling it and installing the newest Windows 7 version fixed the problem.  Clean up your installed codecs and reinstall updated versions of the codecs you need and the problem should be resolved.