Could you try the following
Error 1935: An error occurred during the installation
Published date: 2006-12-18
Autodesk Inventor® Professional 11
Autodesk Inventor® Professional 10
Autodesk Inventor® Series 11
Autodesk Inventor® Series 10
During the installation of Autodesk Inventor®, you received the following
Error 1935-An error occurred during the installation
This error may occur if you were not logged on as an administrator when you
tried to install Autodesk Inventor®. To resolve this error
1.. Log on to the computer as the Local System Administrator. (This is the
default administrator account that is installed with the Microsoft® Windows®
2.. Stop all antivirus and spyware programs using Windows Service
3.. Browse to the system temp folder and delete the contents of this
4.. Run the installation again.
To locate the system temp folder
1.. Click Start menu (Windows) > Run.
2.. In the Run dialog box, enter %temp% and click OK.