You have to go to Path and select where you have the iGO. I explain: Put the folder iGO8 (with complete software, maps, voices,etc.) in the root of your Storage card.
Then you go to Definitions\Path and select: Storage Card\iGO8\iGO.exe (wich is in the iGO8 folder).
Now if you select "Navigation" your iGO will open... I think