I know nothing about viso drawings and word!
Just searched a bit and found this ,about how to add aviso drawing to a word doc.
It may be that when it comes to the viso drawing it is trying to axcess a viso viewer to view the drawing !
I am no dought way off with this!!
http://www.amazingvisio.com/visio_HowTo_ole.htm

Viso viewer .
http://www.microsoft.com/downloads/d...displaylang=en