I think the problems is about some windows updates, but to fix it. you should do the following:
Go to start - all programs - Autodesk - Autodesk inventor xxxx( your version) - Tools - Add-in manger.
Make sure "Inventor Vault" is set to load on startup.
To find "EDM Addin" right click in the list and select show hidden members.
Then set "EDM Addin" to load on startup now everything should work.
/Martin
See attachment
Inventor Routed Systems 2011 SP1 Beta - 3GB switch
Windows XP pro service pack 3
Intel Core 2 2,4GHz - 3,5 GB Ram
Nvidioa Quadro FX 3450/4000 SDI