An update (service pack) for Autodesk Inventor 2009 was recently released. Be sure to read all the FAQ or readme files before you execute any update or pack. We highly recommend you have a backup of all your files as a precaution before you begin.
Autodesk Inventor 2009 Service Pack 1
Inventor Professional 2009
Inventor Routed Systems 2009
Inventor Simulation Suite 2009
Inventor Suite 2009
Go here for a complete list of different versions of Inventor and updates.
Some who have installed this update are experiencing issues with tapped holes. Read the discussion and know that Autodesk has been contacted on this matter.
Also, a few users running Windows Vista as their operating system are getting C++ Windows runtime errors after they have installed this service pack. Autodesk wants Vista users to turn off the UAC of the Vista OS (control pane->User account-> turn on/off UAC) when using Inventor 2009.
If you don't want to turn off UAC permanently, after turning it off, launch Inventor and close it. Then you can turn on UAC again and you should not see the runtime error anymore.