When you say "can't see" do you mean that Visio doesn't find the directory
for the stencils, or once the stencil is loaded, Visio doesn't see the shapes?
Assuming the 1st, there are two methods to find the stencils.
First: either either click on the "shapes" icon on the tool bar or File >
Shapes. Click Open stencil... and then navigate to the directory that has
your Cisco stencils.
Second: goto Menu Bar > Tools > Options and click the Advanced tab. Then,
in the lower left corner, click the File Paths.. button. Then, to the right
of Stencils, click the "..." button. Navigate to the desired directory and
enter it into the form. This will become a defined look up path that Visio
will remember.
HTH
Wapperdude