I have Vue 5 Esprit so I don't know if this applies to V5I, but, in the options menu there is a way to config poser imports.  Take a look in there and make sure it is set to the right version of poser and directed to the correct directory.  Also I don't know if this still is the case, but you can't be running poser at the same time so make sure poser is fully shut down first.