Download Cortona3D Viewer
Cortona3D is free only for personal and non-commercial use.
Select site to download Cortona3D Viewer 6.0
(file name: cortona3d.msi, file size: 4.54MB)
ftp.parallelgraphics.com
http://www.parallelgraphics.com
Run it and follow instructions.
Cortona3D Viewer works as a VRML plug-in for popular Internet browsers (Internet Explorer, Netscape Browser, Mozilla, Mozilla Firefox,Chrome 2.0.172.39 etc.) and office applications (Microsoft PowerPoint, Microsoft Word, etc).