Hi,
I just installed Inventor 2017 and it keeps telling me that i have to reregister Inventor(see picture of error) . I already reinstalled it multiple times and it keeps giving me this error. I also used the microsoft tool to delete the old version.cleanly(As mentioned in other forum posts). It didnt change anything.
Thanks for some help!
See attached link.
Windows 10 x64 -16GB Ram
Intel i7-6700 @ 3.41ghz
nVidia GTS 250 - 1 GB
Inventor Pro 2018
Use the following steps to re-register Autodesk Inventor with your operating system:
1. Exit Inventor if still running
2a. Win 8/8.1/10: Select the Windows start button and type CMD (but do not hit an enter)
2b. Win 7: Select the Windows start button and type CMD in the search field (but do not hit an enter)
3. When CMD or command prompt appears in the list, right mouse click and select run as admin
4. When the command prompt appears, navigate using dos commands to C:\Program Files\Autodesk\Inventor <version>\Bin or where your Inventor.exe is located if you changed the default install location of Inventor.
In this example I'm navigated to my Inventor 2018 (exe) location.
6. Type Inventor.exe /install.
Wait a few mins and restart Inventor. At this time you will not see anything occurring. Don't panic. 
However if you launch Windows task manager you can watch the Inventor.exe process (and see when it ends).
Does that resolve the issue?
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
So what's happening now? Nothing is loading? Are you seeing the splash screen?
If you go into task manager, how many Inventor.exe/processes do you see running?
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
VAR means an Autodesk Value Added Reseller.. Disregard it because VARs don't support student license.
What happens if your RMC on the desktop icon and select run as administrator
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
UPDATE: You indicated you had Inventor 2018 installed (at one point), did that ever work?
Before we do a clean uninstall.. Run the Inventor reset utility
If that doesn't work, I would recommend that you perform a clean uninstall per these instructions. NOTE: The information within the article is solely based on you performing a clean uninstall of all "core" Autodesk products on your machine. In certain situations, you will most likely not be removing all of your Autodesk products to resolve a given issue. If that's the case, you'll need to adjust those settings and locations within the article to make sure you are not impacting those other Autodesk products you plan on leaving on your machine.
Then properly download and install Inventor per this article using one of the provided methods
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
Hi Luca,
The information you provided so far isn't actionable. Please provide the followings.
1. What Windows are you running? Have you applied all critical updates?
2. Are you the admin to the machine?
3. Did you download the three parts Inventor 2017 install files? Or, you install on the fly?
4. Did you uninstall 2018 totally? Go to All Programs -> Autodesk -> Uninstall Tools -> make sure all 2018 related components are uninstalled. Reboot the machine.
Many thanks!
