Inventor 2014 and all earlier versions of Inventor cannot be launched on Windows 8.1 Windows reports:
"The application was unable to start correctly (0xc0000142). Click OK to close the application."
This issue is fixed in Inventor 2014 Service Pack 1. You can download or directly install this service pack from Here.
Inventor LT 2014 Service Pack1 can be down loaded Here
Please note that earlier versions of Inventor will not support Windows 8.1.
Windows Explorer may crash if any earlier versions of Inventor, Inventor LT, or InventorView are installed. Windows will display the "Windows Explorer has stopped working" dialog. To avoid this crash unsupported versions can be uninstalled from the Control Panel.
If you have Inventor 2014 installed you can install the SP directly from the web browser. This will eliminate the need to run 2014 SP1 from a Windows/Run prompt.
Additional Requirement to Re-register Inventor
Perform the steps in the following solution link to re-register Inventor after SP1 is successfully installed.
Unable to Save As or Import DWG/DXF
Products: Inventor;Inventor LT