1.) Delete the folder c:Autodesk (Back this up in case you have other software).
2.)Download the Software again using the browser method. Re-extract the software with WEBROOT virus scan turned off.
3.) exit the installation.
4.) Right clock on the folder c:autodesk and select properties and change permissions to Full Control.
5.) Make sure the WEBROOT software is off.
6.) Go to the extraction folder and right click on the setup.exe and select run as administrator.