First of all delete folder save , you can find it: iGO\save
Then delete folder voice from : iGO\content\voice
Download simple voice from here:
[Only registered and activated users can see links. ]
copy voice .zip file into the path: iGO\content\voice\copy here
Go to sys.txt that you have and delete everything you have in section [sound]
In section sound just add only this:
Run now iGO and make a simulation....