I have downloaded Autodesk Inventor Professional 2012 English 32-bit. I am unable to activate it. There is no digital signature. It will not run, the computer wants to keep installing it and gives me no other options. I can see it on my desktop. I have the serial # and product key #, registration code and registration ID. NOTHING is working.
If the initialization setup won't stop, it could be a Windows profile issue. Have you tried logging in as another user with local admin righs and UAC disabled and seeing if it works there?