Can you make this error happen again? If so, let Autodesk know about it...post it in the official forums at http://forums.autodesk.com/ follow the links to the Inventor forums.
If it generates the Autodesk Crash report tool, I would submit the error that way...Autodesk will get m ore information that may help them solve it!
I would agree with Kevin the right place for you is the autodesk forum.
However, the runtime error predominately occurs own to memory problems, malicious or just a bat moment for your hardware... these things are happening all the time... but if you get this more often a re-installation of inventor might give the answer...