The above image is an example of a common problem for Inventor users. Though pictured is related to the Inventor Task Scheduler, it could be the same problem for the Project Editor, Inventor View, and other specific apps in the Autodesk / Inventor group. It isn’t confined to a particular version nor to a specific operating system.
It will most typically show up following the installation of Inventor service packs, updates, and hotfixes. But it has also occurred following Windows Updates and even installation/updates to seemingly unrelated products (screen casting programs for example). It can also happen if you bounce between two versions of Inventor, for example going from Inventor 2017 to Inventor 2016.
The fixes could be one, two or all of the following. I have ordered the fixes in the order that have offered the most success. Please note, the following list may well require Admin privileges.
a. Right-click the Windows Start button and select Command Prompt (Admin). Don’t you just love DOS!
b. Type in (include quotes): cd “C:\Program Files\Autodesk\Inventor 2017\bin” <Enter>
c. Open the Windows Task Manager, go to ...