Keep getting kicked out of Inventor

[nighterfighter]

Disclaimer: I know almost nothing about Autodesk.

You say it happens when opening certain file types, but does the program also crash/force close if you open just the main menu? Can you make a new part from scratch?

When you uninstalled, did you also clean the registry? Maybe it didn't uninstall correctly. CCleaner is a decent tool for that.

Edit: You said you are running a 64 bit OS, I assume Windows. Is it 7, 8/8.1, or 10? Which versions is Inventor 2014 compatible with? I tried checking Autodesk's system requirements, but all their knowledge-base articles lead to a 404 page.

Also I'd double check to make sure you downloaded a 64 bit installer, (usually denoted with x64, compared to 32 bit which is usually x86)