There are some components in the software that must be registered
with the operating system. Just unzipping the vrtool folder wont do that.
You must install using the
software installer..
(need administrator rights to install, I`m affraid)
Also, if you are running with limited rights, the OS may not let
you write files to the vrtool folder, which is inside
\program files\( I'm to blame for mixing program and data in the same folder )
In that case, create another directory for data files (.nav, .cht, .xml etc).
This should work...