You might have an issue with your installed VB Script. Try creating a new user profile with local admin rights and installing as the new user. If that doesn't work, make sure you have the latest version of the Windows Installer.
Error 1720 doesn't happen very often and it indicates a problem with your Windows and not the Autodesk software.
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Upgrading to a 2015 product? Make sure to check these out 1st!